[DevTools] Rename DevToolsManagerImpl to DevToolsManager.

content/browser/devtools/devtools_manager_impl.cc

-// Copyright (c) 2012 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 "content/browser/devtools/devtools_manager_impl.h"
-
-#include "base/bind.h"
-#include "base/message_loop/message_loop.h"
-#include "content/browser/devtools/devtools_netlog_observer.h"
-#include "content/public/browser/browser_thread.h"
-#include "content/public/browser/content_browser_client.h"
-#include "content/public/browser/devtools_agent_host.h"
-#include "content/public/browser/devtools_manager_delegate.h"
-
-namespace content {
-
-// static
-DevToolsManagerImpl* DevToolsManagerImpl::GetInstance() {
-  return Singleton<DevToolsManagerImpl>::get();
-}
-
-DevToolsManagerImpl::DevToolsManagerImpl()
-    : delegate_(GetContentClient()->browser()->GetDevToolsManagerDelegate()),
-      client_count_(0) {
-}
-
-DevToolsManagerImpl::~DevToolsManagerImpl() {
-  DCHECK(!client_count_);
-}
-
-void DevToolsManagerImpl::OnClientAttached() {
-  if (!client_count_) {
-    BrowserThread::PostTask(
-        BrowserThread::IO,
-        FROM_HERE,
-        base::Bind(&DevToolsNetLogObserver::Attach));
-  }
-  client_count_++;
-}
-
-void DevToolsManagerImpl::OnClientDetached() {
-  client_count_--;
-  if (!client_count_) {
-    BrowserThread::PostTask(
-        BrowserThread::IO,
-        FROM_HERE,
-        base::Bind(&DevToolsNetLogObserver::Detach));
-  }
-}
-
-}  // namespace content