Bug 1441965 - Hide synced tabs sidebar menu items with identity.fxaccounts.enabled. r=markh

MozReview-Commit-ID: DBDOvidfbls

--HG--
extra : rebase_source : 6aeffe1bfaeb774758db3ba37c55a7fda6e8cafd

browser/base/content/browser-menubar.inc

@@ -212,6 +212,7 @@
                               observes="viewHistorySidebar"
                               label="&historyButton.label;"/>
                     <menuitem id="menu_tabsSidebar"
+                              class="sync-ui-item"
                               observes="viewTabsSidebar"
                               label="&syncedTabs.sidebar.label;"/>
                   </menupopup>

browser/base/content/browser.xul

@@ -298,7 +298,7 @@
       </toolbarbutton>
       <toolbarbutton id="sidebar-switcher-tabs"
                      label="&syncedTabs.sidebar.label;"
-                     class="subviewbutton subviewbutton-iconic"
+                     class="subviewbutton subviewbutton-iconic sync-ui-item"
                      observes="viewTabsSidebar"
                      oncommand="SidebarUI.show('viewTabsSidebar');">
         <observes element="viewTabsSidebar" attribute="checked"/>