Makes a handful of DataSources not replace the existing

chrome/browser/webui/chrome_url_data_manager.cc

 // Copyright (c) 2011 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/webui/chrome_url_data_manager.h"
 
 #include <vector>
 
 #include "base/i18n/rtl.h"
 #include "base/message_loop.h"
@@ skipping 30 matching lines @@
 
 ChromeURLDataManager::ChromeURLDataManager(Profile* profile)
     : profile_(profile) {
 }
 
 ChromeURLDataManager::~ChromeURLDataManager() {
 }
 
 void ChromeURLDataManager::AddDataSource(DataSource* source) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
-  registered_source_names_.insert(source->source_name());
   BrowserThread::PostTask(
       BrowserThread::IO, FROM_HERE,
       NewRunnableFunction(AddDataSourceOnIOThread,
                           make_scoped_refptr(profile_->GetRequestContext()),
                           make_scoped_refptr(source)));
 }
 
-bool ChromeURLDataManager::IsRegistered(const std::string& name) {
-  return registered_source_names_.find(name) != registered_source_names_.end();
-}
-
 // static
 void ChromeURLDataManager::DeleteDataSources() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   DataSources sources;
   {
     base::AutoLock lock(delete_lock_);
     if (!data_sources_)
       return;
     data_sources_->swap(sources);
   }
@@ skipping 69 matching lines @@
       BrowserThread::IO, FROM_HERE,
       NewRunnableMethod(this, &DataSource::SendResponseOnIOThread,
                         request_id, make_scoped_refptr(bytes)));
 }
 
 MessageLoop* ChromeURLDataManager::DataSource::MessageLoopForRequestPath(
     const std::string& path) const {
   return message_loop_;
 }
 
+bool ChromeURLDataManager::DataSource::ShouldReplaceExistingSource() const {
+  return true;
+}
+
 // static
 void ChromeURLDataManager::DataSource::SetFontAndTextDirection(
     DictionaryValue* localized_strings) {
   localized_strings->SetString("fontfamily",
       l10n_util::GetStringUTF16(IDS_WEB_FONT_FAMILY));
 
   int web_font_size_id = IDS_WEB_FONT_SIZE;
 #if defined(OS_WIN)
   // Some fonts used for some languages changed a lot in terms of the font
   // metric in Vista. So, we need to use different size before Vista.
   if (base::win::GetVersion() < base::win::VERSION_VISTA)
     web_font_size_id = IDS_WEB_FONT_SIZE_XP;
 #endif
   localized_strings->SetString("fontsize",
       l10n_util::GetStringUTF16(web_font_size_id));
 
   localized_strings->SetString("textdirection",
       base::i18n::IsRTL() ? "rtl" : "ltr");
 }
 
 void ChromeURLDataManager::DataSource::SendResponseOnIOThread(
     int request_id,
     scoped_refptr<RefCountedMemory> bytes) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
   if (backend_)
     backend_->DataAvailable(request_id, bytes);
 }