Make devtools use common generated blink source directory instead of gen/webkit.

extensions/BUILD.gn

 # Copyright 2014 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.
 
 import("//tools/grit/grit_rule.gni")
 import("//tools/grit/repack.gni")
 
 assert(enable_extensions)
 
 # GYP version: extensions/extensions_resources.gyp:extensions_resources
@@ skipping 119 matching lines @@
     "$root_gen_dir/content/content_resources.pak",
     "$root_gen_dir/content/shell/shell_resources.pak",
     "$root_gen_dir/extensions/extensions_browser_resources_100_percent.pak",
     "$root_gen_dir/extensions/extensions_renderer_resources.pak",
     "$root_gen_dir/extensions/extensions_resources.pak",
     "$root_gen_dir/extensions/shell/app_shell_resources.pak",
     "$root_gen_dir/extensions/strings/extensions_strings_en-US.pak",
     "$root_gen_dir/ui/resources/ui_resources_100_percent.pak",
     "$root_gen_dir/ui/strings/app_locale_settings_en-US.pak",
     "$root_gen_dir/ui/strings/ui_strings_en-US.pak",
-    "$root_gen_dir/webkit/devtools_resources.pak",
+    "$root_gen_dir/blink/devtools_resources.pak",
   ]
 
   output = "$root_out_dir/extensions_shell_and_test.pak"
 
   deps = [
     ":extensions_resources",
     "//content:resources",
     "//content/browser/devtools:devtools_resources",
     "//content/shell:resources",
     "//extensions/shell:resources",
@@ skipping 118 matching lines @@
       "//testing/gmock",
       "//testing/gtest",
       "//third_party/leveldatabase",
     ]
 
     if (is_win) {
       deps += [ "//base/allocator" ]
     }
   }
 }