Move DevTools out of ash and turn it to a component.

components/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/chrome_build.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//printing/features/features.gni")
 import("//rlz/features/features.gni")
 import("//testing/test.gni")
@@ skipping 138 matching lines @@
     "//components/update_client:unit_tests",
     "//components/upload_list:unit_tests",
     "//components/url_formatter:unit_tests",
     "//components/url_matcher:unit_tests",
     "//components/variations:unit_tests",
     "//components/variations/service:unit_tests",
     "//components/web_resource:unit_tests",
     "//components/webdata/common:unit_tests",
   ]
 
+  if (toolkit_views && use_aura) {
+    deps += [ "//components/ui_devtools/devtools:unit_tests" ]
+  }
+
   if (enable_nacl) {
     deps += [ "//components/nacl/browser:unit_tests" ]
   }
 
   if (is_ios) {
     deps += [
       "//components/image_fetcher/ios:unit_tests",
       "//components/signin/ios/browser:unit_tests",
       "//components/translate/ios/browser:unit_tests",
     ]
@@ skipping 340 matching lines @@
       "//testing/perf",
       "//url",
     ]
 
     if (!is_ios) {
       sources += [ "discardable_memory/common/discardable_shared_memory_heap_perftest.cc" ]
       deps += [ "//components/discardable_memory/common" ]
     }
   }
 }