Revert "Remove the Social API"

browser/base/content/browser.xul

@@ -268,6 +268,27 @@
       <box id="UITourHighlight"></box>
     </panel>
 
+    <panel id="social-share-panel"
+           class="social-panel"
+           type="arrow"
+           orient="vertical"
+           onpopupshowing="SocialShare.onShowing()"
+           onpopuphidden="SocialShare.onHidden()"
+           hidden="true">
+      <hbox class="social-share-toolbar">
+        <toolbarbutton id="manage-share-providers" class="share-provider-button"
+                       tooltiptext="&social.addons.label;"
+                       oncommand="BrowserOpenAddonsMgr('addons://list/service');
+                                  this.parentNode.parentNode.hidePopup();"/>
+        <arrowscrollbox id="social-share-provider-buttons" orient="horizontal" flex="1" pack="end">
+          <toolbarbutton id="add-share-provider" class="share-provider-button" type="radio"
+                         group="share-providers" tooltiptext="&findShareServices.label;"
+                         oncommand="SocialShare.showDirectory()"/>
+        </arrowscrollbox>
+      </hbox>
+      <hbox id="share-container" flex="1"/>
+    </panel>
+
     <menupopup id="toolbar-context-menu"
                onpopupshowing="onViewToolbarsPopupShowing(event, document.getElementById('viewToolbarsMenuSeparator'));">
       <menuitem oncommand="gCustomizeMode.addToPanel(document.popupNode)"
@@ -405,6 +426,11 @@
 #endif
     </tooltip>
 
+    <tooltip id="share-button-tooltip" onpopupshowing="SocialShare.createTooltip(event);">
+      <label class="tooltip-label"/>
+      <label class="tooltip-label"/>
+    </tooltip>
+
 #include popup-notifications.inc
 
 #include ../../components/customizableui/content/panelUI.inc.xul