Switch PluginObserver to use WebContentsUserData.

chrome/browser/ui/tab_contents/tab_contents.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/tab_contents/tab_contents.h"
 
 #include "base/command_line.h"
 #include "base/lazy_instance.h"
 #include "chrome/browser/autofill/autocomplete_history_manager.h"
 #include "chrome/browser/autofill/autofill_external_delegate.h"
@@ skipping 124 matching lines @@
   extensions::WebNavigationTabObserver::CreateForWebContents(contents);
   favicon_tab_helper_.reset(new FaviconTabHelper(contents));
   find_tab_helper_.reset(new FindTabHelper(contents));
   history_tab_helper_.reset(new HistoryTabHelper(contents));
   hung_plugin_tab_helper_.reset(new HungPluginTabHelper(contents));
   infobar_tab_helper_.reset(new InfoBarTabHelper(contents));
   MetroPinTabHelper::CreateForWebContents(contents);
   password_manager_delegate_.reset(new PasswordManagerDelegateImpl(this));
   password_manager_.reset(
       new PasswordManager(contents, password_manager_delegate_.get()));
+  PluginObserver::CreateForWebContents(contents);
   prefs_tab_helper_.reset(new PrefsTabHelper(contents));
   prerender_tab_helper_.reset(new prerender::PrerenderTabHelper(this));
   SearchEngineTabHelper::CreateForWebContents(contents);
   chrome::search::SearchTabHelper::CreateForWebContents(contents);
   SnapshotTabHelper::CreateForWebContents(contents);
   SSLTabHelper::CreateForWebContents(contents);
   synced_tab_delegate_.reset(new TabContentsSyncedTabDelegate(this));
   translate_tab_helper_.reset(new TranslateTabHelper(contents));
   zoom_controller_.reset(new ZoomController(this));
 
 #if defined(ENABLE_AUTOMATION)
   automation_tab_helper_.reset(new AutomationTabHelper(contents));
 #endif
 
 #if defined(ENABLE_CAPTIVE_PORTAL_DETECTION)
   captive_portal::CaptivePortalTabHelper::CreateForWebContents(contents);
 #endif
 
 #if !defined(OS_ANDROID)
   if (OmniboxSearchHint::IsEnabled(profile()))
     OmniboxSearchHint::CreateForWebContents(contents);
   PDFTabHelper::CreateForWebContents(contents);
   SadTabHelper::CreateForWebContents(contents);
   web_intent_picker_controller_.reset(new WebIntentPickerController(this));
 #endif
 
   external_protocol_observer_.reset(new ExternalProtocolObserver(contents));
   navigation_metrics_recorder_.reset(new NavigationMetricsRecorder(contents));
   pepper_broker_observer_.reset(new PepperBrokerObserver(contents));
-  plugin_observer_.reset(new PluginObserver(this));
   safe_browsing_tab_observer_.reset(
       new safe_browsing::SafeBrowsingTabObserver(this));
 
 #if defined(ENABLE_PRINTING)
   printing::PrintPreviewMessageHandler::CreateForWebContents(contents);
   printing::PrintViewManager::CreateForWebContents(contents);
 #endif
 
   // Start the in-browser thumbnailing if the feature is enabled.
   if (ShouldEnableInBrowserThumbnailing()) {
@@ skipping 56 matching lines @@
 
 ////////////////////////////////////////////////////////////////////////////////
 // WebContentsObserver overrides
 
 void TabContents::WebContentsDestroyed(WebContents* tab) {
   // Destruction of the WebContents should only be done by us from our
   // destructor. Otherwise it's very likely we (or one of the helpers we own)
   // will attempt to access the WebContents and we'll crash.
   DCHECK(in_destructor_);
 }