[epiphany] Clear various WebKit DOM objects after using them

[Tomas Popela <tpopela src gnome org>]

commit d82b3eca7a408df42b8b1f483a4e8cb060e5d3e3
Author: Tomas Popela <tpopela redhat com>
Date:   Wed Jul 27 16:16:00 2016 +0200

    Clear various WebKit DOM objects after using them

 embed/web-extension/ephy-web-dom-utils.c |   33 +++++++++++++++++++++++------
 embed/web-extension/ephy-web-extension.c |    1 +
 embed/web-extension/ephy-web-overview.c  |   10 +++++++-
 3 files changed, 35 insertions(+), 9 deletions(-)
---
diff --git a/embed/web-extension/ephy-web-dom-utils.c b/embed/web-extension/ephy-web-dom-utils.c
index df8408e..cc79509 100644
--- a/embed/web-extension/ephy-web-dom-utils.c
+++ b/embed/web-extension/ephy-web-dom-utils.c
@@ -41,6 +41,7 @@ ephy_web_dom_utils_has_modified_forms (WebKitDOMDocument *document)
   WebKitDOMHTMLCollection *forms;
   gulong forms_n;
   guint i;
+  gboolean modified_forms = FALSE;
 
   forms = webkit_dom_document_get_forms (document);
   forms_n = webkit_dom_html_collection_get_length (forms);
@@ -69,8 +70,11 @@ ephy_web_dom_utils_has_modified_forms (WebKitDOMDocument *document)
           has_data = text && *text;
           g_free (text);
 
-          if (has_data)
-            return TRUE;
+          if (has_data) {
+            g_object_unref (elements);
+            modified_forms = TRUE;
+            goto out;
+          }
         }
 
       if (WEBKIT_DOM_IS_HTML_INPUT_ELEMENT (element))
@@ -82,8 +86,11 @@ ephy_web_dom_utils_has_modified_forms (WebKitDOMDocument *document)
            * modified and it does not have a lot of text the user is
            * likely not very interested in saving this work, so do
            * nothing (eg, google search input). */
-          if (modified_input_element)
-            return TRUE;
+          if (modified_input_element) {
+            g_object_unref (elements);
+            modified_forms = TRUE;
+            goto out;
+          }
 
           modified_input_element = TRUE;
 
@@ -91,13 +98,19 @@ ephy_web_dom_utils_has_modified_forms (WebKitDOMDocument *document)
           length = g_utf8_strlen (text, -1);
           g_free (text);
 
-          if (length > 50)
-            return TRUE;
+          if (length > 50) {
+            g_object_unref (elements);
+            modified_forms = TRUE;
+            goto out;
+          }
         }
     }
+    g_object_unref (elements);
   }
 
-  return FALSE;
+ out:
+  g_object_unref (forms);
+  return modified_forms;
 }
 
 /**
@@ -138,6 +151,7 @@ ephy_web_dom_utils_get_application_title (WebKitDOMDocument *document)
     g_free (property);
     g_free (name);
   }
+  g_object_unref (metas);
 
   return title;
 }
@@ -226,6 +240,7 @@ get_icon_from_html_icon (WebKitDOMDocument *document,
     else
       g_free (rel);
   }
+  g_object_unref (links);
 
   ret = (image != NULL && *image != '\0');
 
@@ -268,6 +283,7 @@ get_icon_from_mstile (WebKitDOMDocument *document,
       }
     }
   }
+  g_object_unref (metas);
 
   ret = (image != NULL && *image != '\0');
 
@@ -306,6 +322,7 @@ get_icon_from_ogp (WebKitDOMDocument *document,
     g_free (property);
     g_free (itemprop);
   }
+  g_object_unref (metas);
 
   ret = (image != NULL && *image != '\0');
 
@@ -345,6 +362,7 @@ get_icon_from_touch_icon (WebKitDOMDocument *document,
     }
     g_free (rel);
   }
+  g_object_unref (links);
 
   /* TODO: Try to retrieve /apple-touch-icon.png, and return it if it exist. */
 
@@ -382,6 +400,7 @@ get_icon_from_favicon (WebKitDOMDocument *document,
     }
     g_free (rel);
   }
+  g_object_unref (links);
 
   /* Last ditch effort: just fallback to the default favicon location. */
   if (image == NULL)
diff --git a/embed/web-extension/ephy-web-extension.c b/embed/web-extension/ephy-web-extension.c
index 0ea5cf0..75524fc 100644
--- a/embed/web-extension/ephy-web-extension.c
+++ b/embed/web-extension/ephy-web-extension.c
@@ -266,6 +266,7 @@ request_decision_on_storing (EphyEmbedFormAuth *form_auth)
     g_warning ("Error sending formAuthData message");
   }
 
+  g_object_unref (dom_window);
   g_free (message);
   g_object_unref (form_auth);
 }
diff --git a/embed/web-extension/ephy-web-overview.c b/embed/web-extension/ephy-web-overview.c
index 379a51c..0557a5a 100644
--- a/embed/web-extension/ephy-web-overview.c
+++ b/embed/web-extension/ephy-web-overview.c
@@ -161,6 +161,7 @@ ephy_web_overview_model_urls_changed (EphyWebOverviewModel *model,
       } else {
         webkit_dom_element_remove_attribute (item->thumbnail, "style");
       }
+      g_clear_object (&class_list);
     } else {
       WebKitDOMDocument *document;
       WebKitDOMElement *item_list, *anchor;
@@ -308,12 +309,16 @@ ephy_web_overview_update_thumbnail_in_model_from_element (EphyWebOverview  *over
   char *thumbnail_path;
 
   style = webkit_dom_element_get_style (thumbnail);
-  if (webkit_dom_css_style_declaration_is_property_implicit (style, "background"))
+  if (webkit_dom_css_style_declaration_is_property_implicit (style, "background")) {
+    g_object_unref (style);
     return;
+  }
 
   background = webkit_dom_css_style_declaration_get_property_value (style, "background");
-  if (!background)
+  if (!background) {
+    g_object_unref (style);
     return;
+  }
 
   thumbnail_path = g_strrstr (background, "file://");
   if (thumbnail_path) {
@@ -337,6 +342,7 @@ ephy_web_overview_update_thumbnail_in_model_from_element (EphyWebOverview  *over
       update_thumbnail_element_style (thumbnail, path);
   }
   g_free (background);
+  g_object_unref (style);
 }
 
 static void