Remove redundant DevToolsManager methods and clean up its clients.

chrome/browser/ui/webui/inspect_ui.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 "chrome/browser/ui/webui/inspect_ui.h"
 
 #include <set>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 97 matching lines @@
 
   return target_data;
 }
 
 bool HasClientHost(RenderViewHost* rvh) {
   if (!DevToolsAgentHost::HasFor(rvh))
     return false;
 
   scoped_refptr<DevToolsAgentHost> agent(
       DevToolsAgentHost::GetOrCreateFor(rvh));
-  return !!DevToolsManager::GetInstance()->GetDevToolsClientHostFor(agent);
+  return agent->IsAttached();
 }
 
 DictionaryValue* BuildTargetDescriptor(RenderViewHost* rvh, bool is_tab) {
   WebContents* web_contents = WebContents::FromRenderViewHost(rvh);
   std::string title;
   std::string target_type = is_tab ? kPageTargetType : "";
   GURL url;
   GURL favicon_url;
   if (web_contents) {
     url = web_contents->GetURL();
@@ skipping 351 matching lines @@
     const content::WebUIDataSource::GotDataCallback& callback,
     int result_code,
     const std::string& response) {
   ListValue result;
   result.AppendInteger(result_code);
   result.AppendString(response);
   std::string json_string;
   base::JSONWriter::Write(&result, &json_string);
   callback.Run(base::RefCountedString::TakeString(&json_string));
 }