Remove inside_chromium_build gyp variable

content/content_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.
 
 {
   'dependencies': [
     '../base/base.gyp:base',
     '../build/temp_gyp/googleurl.gyp:googleurl',
     '../components/tracing.gyp:tracing',
     '../media/media.gyp:media',
@@ skipping 403 matching lines @@
         ['include', '^common/url_schemes\\.cc$'],
       ],
     }, {  # OS!="ios"
       'dependencies': [
         '../cc/cc.gyp:cc',
         '../gpu/gpu.gyp:gles2_c_lib',
         '../gpu/gpu.gyp:gles2_implementation',
         '../gpu/gpu.gyp:gpu_ipc',
         '../ipc/ipc.gyp:ipc',
         '../media/media.gyp:shared_memory_support',
+        '../third_party/WebKit/Source/WebKit/chromium/WebKit.gyp:webkit',
         '../third_party/npapi/npapi.gyp:npapi',
-        '<(webkit_src_dir)/Source/WebKit/chromium/WebKit.gyp:webkit',
         '../ui/gl/gl.gyp:gl',
         '../webkit/support/webkit_support.gyp:glue',
         '../webkit/support/webkit_support.gyp:webkit_base',
         '../webkit/support/webkit_support.gyp:webkit_storage',
       ],
     }],
     ['OS=="android"',{
       'link_settings': {
         'libraries': [
           '-landroid',  # ANativeWindow
@@ skipping 143 matching lines @@
         '..\\third_party\\directxsdk\\files\\Redist\\<(input)',
         '<(output)',
         '<(PRODUCT_DIR)',
         ],
         'msvs_cygwin_shell': 1,
       },
      ]
     }],
   ],
 }