Update ash to use new devtools base agent

ash/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("//testing/test.gni")
 import("//ui/base/ui_features.gni")
 
 assert(use_aura)
@@ skipping 60 matching lines @@
     "common/ash_constants.cc",
     "common/ash_constants.h",
     "common/ash_layout_constants.cc",
     "common/ash_layout_constants.h",
     "common/ash_switches.cc",
     "common/ash_switches.h",
     "common/cast_config_delegate.cc",
     "common/cast_config_delegate.h",
     "common/default_accessibility_delegate.cc",
     "common/default_accessibility_delegate.h",
-    "common/devtools/devtools_dom_agent.cc",
-    "common/devtools/devtools_dom_agent.h",
+    "common/devtools/ash_devtools_dom_agent.cc",
+    "common/devtools/ash_devtools_dom_agent.h",
     "common/drag_drop/drag_image_view.cc",
     "common/drag_drop/drag_image_view.h",
     "common/focus_cycler.cc",
     "common/focus_cycler.h",
     "common/frame/caption_buttons/caption_button_types.h",
     "common/frame/caption_buttons/frame_caption_button.cc",
     "common/frame/caption_buttons/frame_caption_button.h",
     "common/frame/caption_buttons/frame_caption_button_container_view.cc",
     "common/frame/caption_buttons/frame_caption_button_container_view.h",
     "common/frame/caption_buttons/frame_size_button.cc",
@@ skipping 1401 matching lines @@
   if (is_win) {
     configs -= [ "//build/config/win:console" ]
     configs += [ "//build/config/win:windowed" ]
     deps += [ "//sandbox" ]
   }
 
   if (is_chromeos) {
     deps += [ "//device/bluetooth" ]
   }
 }