GTK: Make the gtk port compile with GTK_DISABLE_SINGLE_INCLUDES.

build/common.gypi

 # Copyright (c) 2011 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 976 matching lines @@
       }],
       ['use_aura==1', {
         'defines': ['USE_AURA=1'],
       }],
       ['use_nss==1', {
         'defines': ['USE_NSS=1'],
       }],
       ['toolkit_uses_gtk==1', {
         'defines': ['TOOLKIT_USES_GTK=1'],
       }],
+      ['toolkit_uses_gtk==1 and toolkit_views==0', {
+        # TODO(erg): We are progressively sealing up use of deprecated features
+        # in gtk in preparation for an eventual porting to gtk3.
+        'defines': ['GTK_DISABLE_SINGLE_INCLUDES=1'],
+      }],
       ['chromeos==1', {
         'defines': ['OS_CHROMEOS=1'],
       }],
       ['touchui==1', {
         'defines': ['TOUCH_UI=1'],
       }],
       ['use_virtual_keyboard==1', {
         'defines': ['USE_VIRTUAL_KEYBOARD=1'],
       }],
       ['use_xi2_mt!=0', {
@@ skipping 1625 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',
   },
 }