[evolution] Address few more WebKitDOM objects memory leaks

[Milan Crha <mcrha src gnome org>]

commit 9f6da533d32a4f670d4960ad20959dce9773bde9
Author: Milan Crha <mcrha redhat com>
Date:   Mon Feb 23 14:11:57 2015 +0100

    Address few more WebKitDOM objects memory leaks
    
    Filled and discussed in bug 744401.

 e-util/e-web-view.c |   18 ++++++++++++++++--
 1 files changed, 16 insertions(+), 2 deletions(-)
---
diff --git a/e-util/e-web-view.c b/e-util/e-web-view.c
index 613f83d..e9b130a 100644
--- a/e-util/e-web-view.c
+++ b/e-util/e-web-view.c
@@ -3329,6 +3329,11 @@ e_web_view_create_and_add_css_style_sheet (WebKitDOMDocument *document,
        style_element = webkit_dom_document_get_element_by_id (document, style_sheet_id);
 
        if (!style_element) {
+               WebKitDOMText *dom_text;
+               WebKitDOMHTMLHeadElement *head;
+
+               dom_text = webkit_dom_document_create_text_node (document, "");
+
                /* Create new <style> element */
                style_element = webkit_dom_document_create_element (document, "style", NULL);
                webkit_dom_element_set_id (
@@ -3340,13 +3345,19 @@ e_web_view_create_and_add_css_style_sheet (WebKitDOMDocument *document,
                webkit_dom_node_append_child (
                        WEBKIT_DOM_NODE (style_element),
                        /* WebKit hack - we have to insert empty TextNode into style element */
-                       WEBKIT_DOM_NODE (webkit_dom_document_create_text_node (document, "")),
+                       WEBKIT_DOM_NODE (dom_text),
                        NULL);
 
+               head = webkit_dom_document_get_head (document);
+
                webkit_dom_node_append_child (
-                       WEBKIT_DOM_NODE (webkit_dom_document_get_head (document)),
+                       WEBKIT_DOM_NODE (head),
                        WEBKIT_DOM_NODE (style_element),
                        NULL);
+
+               g_object_unref (head);
+               g_object_unref (dom_text);
+               g_object_unref (style_element);
        }
 }
 
@@ -3409,6 +3420,9 @@ add_css_rule_into_style_sheet (WebKitDOMDocument *document,
        /* Insert the rule at the end, so it will override previously inserted */
        webkit_dom_css_style_sheet_add_rule (
                WEBKIT_DOM_CSS_STYLE_SHEET (sheet), selector, style, length, NULL);
+
+       g_object_unref (sheet);
+       g_object_unref (style_element);
 }
 
 static void