[epiphany/mcatanzaro/thumbnail-background-position] Rewrite Ephy.Overview.Item.thumbnailPath()

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 3b40c9abc5ad3b805dcedd444dfda0cb4eadf135
Author: Michael Catanzaro <mcatanzaro gnome org>
Date:   Tue Aug 6 13:02:27 2019 -0500

    Rewrite Ephy.Overview.Item.thumbnailPath()
    
    The original implementation works, but it seems fragile and I have no
    idea why this approach was chosen. This simpler implementation seems to
    work.

 embed/web-process-extension/resources/js/overview.js | 13 +++----------
 1 file changed, 3 insertions(+), 10 deletions(-)
---
diff --git a/embed/web-process-extension/resources/js/overview.js 
b/embed/web-process-extension/resources/js/overview.js
index df65a6272..46f1bcd32 100644
--- a/embed/web-process-extension/resources/js/overview.js
+++ b/embed/web-process-extension/resources/js/overview.js
@@ -221,18 +221,11 @@ Ephy.Overview.Item = class OverviewItem
 
     thumbnailPath()
     {
-        let style = this._thumbnail.style;
-        if (style.isPropertyImplicit('background'))
+        let backgroundImage = this._thumbnail.style.backgroundImage;
+        if (!backgroundImage || !background.startsWith('url("file://'))
             return null;
 
-        let background = style.getPropertyValue('background');
-        if (!background)
-            return null;
-
-        if (background.startsWith('url("file://'))
-            return background.replace('url("file://', '').replace('"); background-size: 100%', '');
-
-        return null;
+        return background.replace('url("file://', '');
     }
 
     setThumbnailPath(path)