Don't derive from ChromeURLDataManager::DataSource, and instead have these classes implement a dele…

chrome/browser/ui/webui/devtools_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/devtools_ui.h"
 
 #include <string>
 
 #include "base/memory/ref_counted_memory.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/string_util.h"
 #include "chrome/browser/net/chrome_url_request_context.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/webui/chrome_url_data_manager.h"
 #include "chrome/common/url_constants.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/devtools_client_host.h"
 #include "content/public/browser/devtools_http_handler.h"
 #include "content/public/browser/render_view_host.h"
+#include "content/public/browser/url_data_source_delegate.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/browser/web_ui.h"
 #include "ui/base/resource/resource_bundle.h"
 
 using content::BrowserThread;
 using content::WebContents;
 
 namespace {
 
 std::string PathWithoutParams(const std::string& path) {
   return GURL(std::string("chrome-devtools://devtools/") + path)
       .path().substr(1);
 }
 
 }  // namespace
 
-class DevToolsDataSource : public ChromeURLDataManager::DataSource {
+class DevToolsDataSource : public content::URLDataSourceDelegate {
  public:
   DevToolsDataSource();
 
+  // content::URLDataSourceDelegate implementation.
+  virtual std::string GetSource() OVERRIDE;
   virtual void StartDataRequest(const std::string& path,
                                 bool is_incognito,
-                                int request_id);
-  virtual std::string GetMimeType(const std::string& path) const;
+                                int request_id) OVERRIDE;
+  virtual std::string GetMimeType(const std::string& path) const OVERRIDE;
 
  private:
   ~DevToolsDataSource() {}
   DISALLOW_COPY_AND_ASSIGN(DevToolsDataSource);
 };
 
 
-DevToolsDataSource::DevToolsDataSource()
-    : DataSource(chrome::kChromeUIDevToolsHost, NULL) {
+DevToolsDataSource::DevToolsDataSource() {
+}
+
+std::string DevToolsDataSource::GetSource() {
+  return chrome::kChromeUIDevToolsHost;
 }
 
 void DevToolsDataSource::StartDataRequest(const std::string& path,
                                           bool is_incognito,
                                           int request_id) {
   std::string filename = PathWithoutParams(path);
 
 
   int resource_id =
       content::DevToolsHttpHandler::GetFrontendResourceId(filename);
 
   DLOG_IF(WARNING, -1 == resource_id) << "Unable to find dev tool resource: "
       << filename << ". If you compiled with debug_devtools=1, try running"
       " with --debug-devtools.";
   const ResourceBundle& rb = ResourceBundle::GetSharedInstance();
   scoped_refptr<base::RefCountedStaticMemory> bytes(rb.LoadDataResourceBytes(
       resource_id));
-  SendResponse(request_id, bytes);
+  url_data_source()->SendResponse(request_id, bytes);
 }
 
 std::string DevToolsDataSource::GetMimeType(const std::string& path) const {
   std::string filename = PathWithoutParams(path);
   if (EndsWith(filename, ".html", false)) {
     return "text/html";
   } else if (EndsWith(filename, ".css", false)) {
     return "text/css";
   } else if (EndsWith(filename, ".js", false)) {
     return "application/javascript";
   } else if (EndsWith(filename, ".png", false)) {
     return "image/png";
   } else if (EndsWith(filename, ".gif", false)) {
     return "image/gif";
   }
   NOTREACHED();
   return "text/plain";
 }
 
 // static
 void DevToolsUI::RegisterDevToolsDataSource(Profile* profile) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   static bool registered = false;
   if (!registered) {
-    DevToolsDataSource* data_source = new DevToolsDataSource();
-    ChromeURLDataManager::AddDataSource(profile, data_source);
+    ChromeURLDataManager::AddDataSource(profile, new DevToolsDataSource);
     registered = true;
   }
 }
 
 DevToolsUI::DevToolsUI(content::WebUI* web_ui) : WebUIController(web_ui) {
-  DevToolsDataSource* data_source = new DevToolsDataSource();
-  Profile* profile = Profile::FromWebUI(web_ui);
-  ChromeURLDataManager::AddDataSource(profile, data_source);
+  ChromeURLDataManager::AddDataSource(
+      Profile::FromWebUI(web_ui), new DevToolsDataSource);
 }
 
 void DevToolsUI::RenderViewCreated(
     content::RenderViewHost* render_view_host) {
   content::DevToolsClientHost::SetupDevToolsFrontendClient(render_view_host);
 }