Remove inside_chromium_build gyp variable

content/content_browser.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.
 
 {
   'dependencies': [
     'browser/speech/proto/speech_proto.gyp:speech_proto',
     '../base/base.gyp:base_static',
     '../crypto/crypto.gyp:crypto',
     '../google_apis/google_apis.gyp:google_apis',
@@ skipping 1069 matching lines @@
         ['exclude', '^browser/speech/input_tag_speech_dispatcher_host\\.cc$$'],
         ['include', '^browser/user_metrics\\.cc$'],
         ['include', '^browser/web_contents/navigation_entry_impl\\.cc$'],
       ],
     }, {  # OS!="ios"
       'dependencies': [
         'browser/devtools/devtools_resources.gyp:devtools_resources',
         '../cc/cc.gyp:cc',
         '../net/net.gyp:http_server',
         '../printing/printing.gyp:printing',
-        '<(webkit_src_dir)/Source/WebKit/chromium/WebKit.gyp:webkit',
+        '../third_party/WebKit/Source/WebKit/chromium/WebKit.gyp:webkit',
         '../ui/surface/surface.gyp:surface',
         '../webkit/support/webkit_support.gyp:webkit_resources',
         '../webkit/support/webkit_support.gyp:webkit_storage',
         '../webkit/support/webkit_support.gyp:webkit_strings',
       ],
     }],
     ['OS!="mac" and OS!="ios"', {
       'dependencies': [
         '../sandbox/sandbox.gyp:sandbox',
       ],
@@ skipping 244 matching lines @@
         '../third_party/speex/speex.gyp:libspeex',
       ],
     }],
     ['linux_use_libgps==1', {
       'dependencies': [
         '../build/linux/system.gyp:libgps',
       ],
     }],
   ],
 }