Factor out dependncy on download throttling from core download code.

chrome/browser/ui/tab_contents/tab_contents_wrapper.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/ui/tab_contents/tab_contents_wrapper.h"
 
 #include "base/utf_string_conversions.h"
 
 #include "base/command_line.h"
 #include "base/lazy_instance.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/autocomplete_history_manager.h"
 #include "chrome/browser/autofill/autofill_manager.h"
 #include "chrome/browser/automation/automation_tab_helper.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/browser_shutdown.h"
 #include "chrome/browser/content_settings/tab_specific_content_settings.h"
 #include "chrome/browser/custom_handlers/protocol_handler_registry.h"
 #include "chrome/browser/custom_handlers/register_protocol_handler_infobar_delegate.h"
+#include "chrome/browser/download/download_request_limiter_observer.h"
 #include "chrome/browser/extensions/extension_tab_helper.h"
 #include "chrome/browser/extensions/extension_webnavigation_api.h"
 #include "chrome/browser/external_protocol/external_protocol_observer.h"
 #include "chrome/browser/favicon/favicon_tab_helper.h"
 #include "chrome/browser/file_select_helper.h"
 #include "chrome/browser/google/google_util.h"
 #include "chrome/browser/history/history_tab_helper.h"
 #include "chrome/browser/intents/register_intent_handler_infobar_delegate.h"
 #include "chrome/browser/intents/web_intent_data.h"
 #include "chrome/browser/omnibox_search_hint.h"
@@ skipping 121 matching lines @@
   }
 #endif
   search_engine_tab_helper_.reset(new SearchEngineTabHelper(contents));
   ssl_helper_.reset(new TabContentsSSLHelper(this));
   content_settings_.reset(new TabSpecificContentSettings(contents));
   translate_tab_helper_.reset(new TranslateTabHelper(contents));
   print_view_manager_.reset(new printing::PrintViewManager(this));
 
   // Create the per-tab observers.
   external_protocol_observer_.reset(new ExternalProtocolObserver(contents));
+  download_request_limiter_observer_.reset(
+      new DownloadRequestLimiterObserver(contents));
   file_select_observer_.reset(new FileSelectObserver(contents));
   plugin_observer_.reset(new PluginObserver(this));
   prerender_observer_.reset(new prerender::PrerenderObserver(this));
   print_preview_.reset(new printing::PrintPreviewMessageHandler(contents));
   webnavigation_observer_.reset(
       new ExtensionWebNavigationTabObserver(contents));
   // Start the in-browser thumbnailing if the feature is enabled.
   if (switches::IsInBrowserThumbnailingEnabled()) {
     thumbnail_generation_observer_.reset(new ThumbnailGenerator);
     thumbnail_generation_observer_->StartThumbnailing(tab_contents_.get());
@@ skipping 564 matching lines @@
   if (infobars_.empty()) {
     registrar_.Remove(this, content::NOTIFICATION_NAV_ENTRY_COMMITTED,
         Source<NavigationController>(&tab_contents_->controller()));
   }
 }
 
 void TabContentsWrapper::RemoveAllInfoBars(bool animate) {
   while (!infobars_.empty())
     RemoveInfoBarInternal(GetInfoBarDelegateAt(infobar_count() - 1), animate);
 }