Bug 1544012 - Remove border around the content area in restored windows on Windows 7 and 8. r=ntim

Differential Revision: https://phabricator.services.mozilla.com/D27292

browser/base/content/browser.xhtml

@@ -2246,7 +2246,6 @@
   </box>
 
   <hbox flex="1" id="browser">
-    <vbox id="browser-border-start" hidden="true" layer="true"/>
     <vbox id="sidebar-box" hidden="true" class="chromeclass-extrachrome">
       <box id="sidebar-header" align="center">
         <toolbarbutton id="sidebar-switcher-target" flex="1" class="tabbable">
@@ -2275,7 +2274,6 @@
                     flex="1" class="plain" selectedIndex="0"/>
       </tabbox>
     </vbox>
-    <vbox id="browser-border-end" hidden="true" layer="true"/>
   </hbox>
 
   <html:template id="customizationPanel">