Remove inside_chromium_build gyp variable

webkit/base/webkit_base.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.
 
 {
   'targets': [
     {
       'target_name': 'webkit_base',
       'type': '<(component)',
       'variables': { 'enable_wexit_time_destructors': 1, },
       'dependencies': [
         '<(DEPTH)/base/base.gyp:base',
         '<(DEPTH)/build/temp_gyp/googleurl.gyp:googleurl',
         '<(DEPTH)/net/net.gyp:net',
-        '<(webkit_src_dir)/Source/WebKit/chromium/WebKit.gyp:webkit',
+        '<(DEPTH)/third_party/WebKit/Source/WebKit/chromium/WebKit.gyp:webkit',
       ],
       'defines': ['WEBKIT_BASE_IMPLEMENTATION'],
       'sources': [
         'data_element.cc',
         'data_element.h',
         'file_path_string_conversions.cc',
         'file_path_string_conversions.h',
         'webkit_base_export.h',
       ],
-      'conditions': [
-        ['inside_chromium_build==0', {
-          'dependencies': [
-            '<(DEPTH)/webkit/support/setup_third_party.gyp:third_party_headers',
-          ],
-        }],
-      ],
     },
   ],
 }