Destroy XServerPixelBuffer before closing X Display.

BUG=123497


Review URL: http://codereview.chromium.org/10096003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@132368 0039d316-1c4b-4281-b951-d872f2087c98

remoting/host/capturer_linux.cc

@@ -426,6 +426,8 @@ void CapturerLinux::DeinitXlib() {
     gc_ = NULL;
   }
 
+  x_server_pixel_buffer_.Release();
+
   if (display_) {
     if (damage_handle_)
       XDamageDestroy(display_, damage_handle_);