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

content/shell/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("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//tools/grit/repack.gni")
 import("//tools/grit/grit_rule.gni")
 if (is_android) {
   import("//build/config/android/config.gni")
@@ skipping 452 matching lines @@
     "//content:resources",
     "//content/app/resources",
     "//content/app/strings",
     "//content/browser/tracing:resources",
     "//net:net_resources",
     "//third_party/WebKit/public:resources",
     "//ui/resources",
     "//ui/strings",
   ]
 
-  sources += [ "$root_gen_dir/webkit/devtools_resources.pak" ]
+  sources += [ "$root_gen_dir/blink/devtools_resources.pak" ]
   deps += [ "//content/browser/devtools:resources" ]
   output = "$root_out_dir/content_shell.pak"
 }
 
 # TODO(GYP): Figure out what this should be on android
 # and make linking this work on the Mac.
 if (!is_android && !is_mac) {
   executable("content_shell") {
     testonly = true
 
@@ skipping 27 matching lines @@
 
     if (is_android && !is_android_webview_build) {
       # Some tests rely on this tool. It might be nicer if these tests relied on
       # image diff rather than having content shell depend on it.
       datadeps = [
         "//tools/imagediff($host_toolchain)",
       ]
     }
   }
 }