Remove inside_chromium_build gyp variable

cc/cc.gyp

 # 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.
 
 {
   'variables': {
     'chromium_code': 1,
     'cc_source_files': [
       'animation/animation.cc',
       'animation/animation.h',
@@ skipping 332 matching lines @@
       'trees/proxy.h',
       'trees/quad_culler.cc',
       'trees/quad_culler.h',
       'trees/single_thread_proxy.cc',
       'trees/single_thread_proxy.h',
       'trees/thread_proxy.cc',
       'trees/thread_proxy.h',
       'trees/tree_synchronizer.cc',
       'trees/tree_synchronizer.h',
     ],
-    'conditions': [
-      ['inside_chromium_build==1', {
-        'webkit_src_dir': '<(DEPTH)/third_party/WebKit',
-      }, {
-        'webkit_src_dir': '<(DEPTH)/../../..',
-      }],
-    ],
   },
-  'conditions': [
-    ['inside_chromium_build==0', {
-      'defines': [
-        'INSIDE_WEBKIT_BUILD=1',
-      ],
-    }],
-  ],
   'targets': [
     {
       'target_name': 'cc',
       'type': '<(component)',
       'dependencies': [
         '<(DEPTH)/base/base.gyp:base',
         '<(DEPTH)/base/third_party/dynamic_annotations/dynamic_annotations.gyp:dynamic_annotations',
         '<(DEPTH)/gpu/gpu.gyp:gpu',
         '<(DEPTH)/skia/skia.gyp:skia',
         '<(DEPTH)/media/media.gyp:media',
         '<(DEPTH)/ui/gl/gl.gyp:gl',
         '<(DEPTH)/ui/surface/surface.gyp:surface',
         '<(DEPTH)/ui/ui.gyp:ui',
-        '<(webkit_src_dir)/Source/WebKit/chromium/WebKit.gyp:webkit',
+        '<(DEPTH)/third_party/WebKit/Source/WebKit/chromium/WebKit.gyp:webkit',
       ],
       'defines': [
         'CC_IMPLEMENTATION=1',
       ],
       'sources': [
         '<@(cc_source_files)',
       ],
       # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
       'msvs_disabled_warnings': [ 4267, ],
     },
   ],
 }