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

components/ui_devtools/devtools_base_agent.h

 // 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.
 
 #ifndef COMPONENTS_UI_DEVTOOLS_DEVTOOLS_BASE_AGENT_H_
 #define COMPONENTS_UI_DEVTOOLS_DEVTOOLS_BASE_AGENT_H_
 
 #include "components/ui_devtools/Protocol.h"
 
-namespace ui {
-namespace devtools {
+namespace ui_devtools {
 
 class UiDevToolsAgent {
  public:
   UiDevToolsAgent() {}
   virtual ~UiDevToolsAgent() {}
 
   virtual void Init(protocol::UberDispatcher*) = 0;
   virtual void Disable() = 0;
 };
 
@@ skipping 10 matching lines @@
   void Init(protocol::UberDispatcher* dispatcher) override {
     frontend_.reset(
         new typename DomainMetainfo::FrontendClass(dispatcher->channel()));
     DomainMetainfo::DispatcherClass::wire(dispatcher, this);
   }
 
   void Disable() override { disable(); }
 
   // Common methods between all generated Backends, subclasses may
   // choose to override them (but not necessary).
-  ui::devtools::protocol::Response enable() override {
-    return ui::devtools::protocol::Response::OK();
+  ui_devtools::protocol::Response enable() override {
+    return ui_devtools::protocol::Response::OK();
   };
 
-  ui::devtools::protocol::Response disable() override {
-    return ui::devtools::protocol::Response::OK();
+  ui_devtools::protocol::Response disable() override {
+    return ui_devtools::protocol::Response::OK();
   };
 
  protected:
   UiDevToolsBaseAgent() {}
   typename DomainMetainfo::FrontendClass* frontend() const {
     return frontend_.get();
   }
 
  private:
   std::unique_ptr<typename DomainMetainfo::FrontendClass> frontend_;
 
   DISALLOW_COPY_AND_ASSIGN(UiDevToolsBaseAgent);
 };
 
-}  // namespace devtools
-}  // namespace ui
+}  // namespace ui_devtools
 
 #endif  // COMPONENTS_UI_DEVTOOLS_DEVTOOLS_BASE_AGENT_H_