Update ash to use new devtools base agent

ash/common/devtools/ash_devtools_dom_agent.cc

 // Copyright 2016 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.
 
-#include "ash/common/devtools/devtools_dom_agent.h"
+#include "ash/common/devtools/ash_devtools_dom_agent.h"
 
-#include "ash/common/wm_shell.h"
 #include "ash/common/wm_window.h"
-#include "components/ui_devtools/DOM.h"
 #include "components/ui_devtools/devtools_server.h"
 #include "ui/views/view.h"
 #include "ui/views/widget/widget.h"
 
 namespace ash {
 namespace devtools {
 
 namespace {
 using namespace ui::devtools::protocol;
 
@@ skipping 81 matching lines @@
 }
 
 void AshDevToolsDOMAgent::getDocument(
     ui::devtools::protocol::ErrorString* error,
     std::unique_ptr<ui::devtools::protocol::DOM::Node>* out_root) {
   *out_root = BuildInitialTree();
 }
 
 }  // namespace devtools
 }  // namespace ash