Back out d9c1eb0c7b8d (bug 804068) for forgetting there was a browser-chrome test to adjust

browser/base/content/browser-social.js

@@ -593,7 +593,7 @@ let SocialShareButton = {
       shareButton.setAttribute("tooltiptext", this.promptMessages['shareTooltip']);
       imageURL = this.promptImages["share"]
     }
-    shareButton.src = imageURL;
+    shareButton.style.backgroundImage = 'url("' + encodeURI(imageURL) + '")';
   }
 };
 

browser/themes/gnomestripe/browser.css

@@ -1378,6 +1378,11 @@ richlistitem[type~="action"][actiontype="switchtab"] > .ac-url-box > .ac-action-
 
 /* social recommending panel */
 
+#share-button {
+  width: 16px;
+  height: 16px;
+}
+
 #socialUserPortrait {
   width: 48px;
   height: 48px;

browser/themes/pinstripe/browser.css

@@ -1636,6 +1636,11 @@ window[tabsontop="false"] richlistitem[type~="action"][actiontype="switchtab"][s
 
 /* social recommending panel */
 
+#share-button {
+  width: 16px;
+  height: 16px;
+}
+
 #socialUserPortrait {
   width: 48px;
   height: 48px;

browser/themes/winstripe/browser.css

@@ -1640,6 +1640,11 @@ richlistitem[type~="action"][actiontype="switchtab"] > .ac-url-box > .ac-action-
 
 /* social recommending panel */
 
+#share-button {
+  width: 16px;
+  height: 16px;
+}
+
 #socialUserPortrait {
   width: 48px;
   height: 48px;