Remove PrefObserver usage, batch 9.

chrome/browser/safe_browsing/safe_browsing_tab_observer.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/safe_browsing/safe_browsing_tab_observer.h"
 
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/prefs/pref_service.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/chrome_notification_types.h"
@@ skipping 20 matching lines @@
 #endif
 
 SafeBrowsingTabObserver::SafeBrowsingTabObserver(
     content::WebContents* web_contents) : web_contents_(web_contents) {
 #if defined(ENABLE_SAFE_BROWSING)
   Profile* profile =
       Profile::FromBrowserContext(web_contents->GetBrowserContext());
   PrefService* prefs = profile->GetPrefs();
   if (prefs) {
     pref_change_registrar_.Init(prefs);
-    pref_change_registrar_.Add(prefs::kSafeBrowsingEnabled, this);
+    pref_change_registrar_.Add(
+        prefs::kSafeBrowsingEnabled,
+        base::Bind(&SafeBrowsingTabObserver::UpdateSafebrowsingDetectionHost,
+                   base::Unretained(this)));
 
     if (prefs->GetBoolean(prefs::kSafeBrowsingEnabled) &&
         g_browser_process->safe_browsing_detection_service()) {
       safebrowsing_detection_host_.reset(
           ClientSideDetectionHost::Create(web_contents));
     }
   }
 #endif
 }
 
 SafeBrowsingTabObserver::~SafeBrowsingTabObserver() {
 }
 
 ////////////////////////////////////////////////////////////////////////////////
-// content::NotificationObserver overrides
-
-void SafeBrowsingTabObserver::OnPreferenceChanged(
-    PrefServiceBase* service,
-    const std::string& pref_name) {
-  Profile* profile =
-      Profile::FromBrowserContext(web_contents_->GetBrowserContext());
-  DCHECK(service == profile->GetPrefs());
-  if (pref_name == prefs::kSafeBrowsingEnabled) {
-    UpdateSafebrowsingDetectionHost();
-  } else {
-    NOTREACHED() << "unexpected pref change notification" << pref_name;
-  }
-}
-
-////////////////////////////////////////////////////////////////////////////////
 // Internal helpers
 
 void SafeBrowsingTabObserver::UpdateSafebrowsingDetectionHost() {
 #if defined(ENABLE_SAFE_BROWSING)
   Profile* profile =
       Profile::FromBrowserContext(web_contents_->GetBrowserContext());
   PrefService* prefs = profile->GetPrefs();
   bool safe_browsing = prefs->GetBoolean(prefs::kSafeBrowsingEnabled);
   if (safe_browsing &&
       g_browser_process->safe_browsing_detection_service()) {
     if (!safebrowsing_detection_host_.get()) {
       safebrowsing_detection_host_.reset(
           ClientSideDetectionHost::Create(web_contents_));
     }
   } else {
     safebrowsing_detection_host_.reset();
   }
 
   content::RenderViewHost* rvh = web_contents_->GetRenderViewHost();
   rvh->Send(new ChromeViewMsg_SetClientSidePhishingDetection(
       rvh->GetRoutingID(), safe_browsing));
 #endif
 }
 
 }  // namespace safe_browsing