GYP fix: toolkit_uses_gtk% should be dependent on use_aura%.

build/common.gypi

 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # IMPORTANT:
 # Please don't directly include this file if you are building via gyp_chromium,
 # since gyp_chromium is automatically forcing its inclusion.
 {
   # Variables expected to be overriden on the GYP command line (-D) or by
   # ~/.gyp/include.gypi.
@@ skipping 307 matching lines @@
         # Flags to use X11 on non-Mac POSIX platforms
         ['OS=="win" or OS=="mac" or OS=="android"', {
           'use_glib%': 0,
           'use_x11%': 0,
         }, {
           'use_glib%': 1,
           'use_x11%': 1,
         }],
 
         # Set toolkit_uses_gtk for the Chromium browser on Linux.
-        ['OS=="linux" and chromeos==0', {
+        ['OS=="linux" and use_aura==0', {
           'toolkit_uses_gtk%': 1,
         }, {
           'toolkit_uses_gtk%': 0,
         }],
 
         # We always use skia text rendering in Aura on Windows, since GDI
         # doesn't agree with our BackingStore.
         # TODO(beng): remove once skia text rendering is on by default.
         ['use_aura==1 and OS=="win"', {
           'enable_skia_text%': 1,
@@ skipping 2586 matching lines @@
     # settings in target dicts.  SYMROOT is a special case, because many other
     # Xcode variables depend on it, including variables such as
     # PROJECT_DERIVED_FILE_DIR.  When a source group corresponding to something
     # like PROJECT_DERIVED_FILE_DIR is added to a project, in order for the
     # files to appear (when present) in the UI as actual files and not red
     # red "missing file" proxies, the correct path to PROJECT_DERIVED_FILE_DIR,
     # and therefore SYMROOT, needs to be set at the project level.
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }