It is time.

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 172 matching lines @@
         # Default MIPS arch variant. This is set in the conditions block
         # below for MIPS targets.
         'mips_arch_variant%': '',
 
         'conditions': [
           # Ash needs Aura.
           ['use_aura==0', {
             'use_ash%': 0,
           }],
 
-          # Set default value of toolkit_views based on OS.
-          ['OS=="win" or chromeos==1 or use_aura==1', {
-            'toolkit_views%': 1,
-          }, {
-            'toolkit_views%': 0,
-          }],
-
           # Embedded builds use aura without ash or views.
           ['embedded==1', {
             'use_aura%': 1,
             'use_ash%': 0,
             'toolkit_views%': 0,
           }],
 
           # Enable HiDPI on Mac OS, Chrome OS and Windows.
           ['OS=="mac" or chromeos==1 or OS=="win"', {
             'enable_hidpi%': 1,
@@ skipping 2372 matching lines @@
         # things when their commandline changes). Nothing should ever read this
         # define.
         'defines': ['CR_CLANG_REVISION=<!(<(DEPTH)/tools/clang/scripts/update.sh --print-revision)'],
       }],
       ['enable_rlz==1', {
         'defines': ['ENABLE_RLZ'],
       }],
       ['component=="shared_library"', {
         'defines': ['COMPONENT_BUILD'],
       }],
-      ['toolkit_views==1', {
-        'defines': ['TOOLKIT_VIEWS=1'],
-      }],
       ['ui_compositor_image_transport==1', {
         'defines': ['UI_COMPOSITOR_IMAGE_TRANSPORT'],
       }],
       ['use_aura==1', {
         'defines': ['USE_AURA=1'],
       }],
       ['use_ash==1', {
         'defines': ['USE_ASH=1'],
       }],
       ['use_pango==1', {
@@ skipping 3236 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',
   },
 }