Remove content::NotificationObserver dependency from most Prefs code.

chrome/browser/safe_browsing/safe_browsing_service.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_service.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/callback.h"
 #include "base/command_line.h"
@@ skipping 1347 matching lines @@
         AddPrefService(profile->GetPrefs());
       break;
     }
     case chrome::NOTIFICATION_PROFILE_DESTROYED: {
       DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
       Profile* profile = content::Source<Profile>(source).ptr();
       if (!profile->IsOffTheRecord())
         RemovePrefService(profile->GetPrefs());
       break;
     }
-    case chrome::NOTIFICATION_PREF_CHANGED: {
-      DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
-      std::string* pref = content::Details<std::string>(details).ptr();
-      DCHECK(*pref == prefs::kSafeBrowsingEnabled);
-      RefreshState();
-      break;
-    }
     default:
       NOTREACHED();
   }
 }
 
+void SafeBrowsingService::OnPreferenceChanged(PrefServiceBase* service,
+                                              const std::string& pref_name) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  DCHECK(pref_name == prefs::kSafeBrowsingEnabled);
+  RefreshState();
+}
+
 bool SafeBrowsingService::IsWhitelisted(const UnsafeResource& resource) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   // Check if the user has already ignored our warning for this render_view
   // and domain.
   for (size_t i = 0; i < white_listed_entries_.size(); ++i) {
     const WhiteListedEntry& entry = white_listed_entries_[i];
     if (entry.render_process_host_id == resource.render_process_host_id &&
         entry.render_view_id == resource.render_view_id &&
         // Threat type must be the same or in the case of phishing they can
         // either be client-side phishing URL or a SafeBrowsing phishing URL.
@@ skipping 49 matching lines @@
     Stop();
 
   if (csd_service_.get())
     csd_service_->SetEnabledAndRefreshState(enable);
   if (download_service_.get()) {
     download_service_->SetEnabled(
         enable && !CommandLine::ForCurrentProcess()->HasSwitch(
             switches::kDisableImprovedDownloadProtection));
   }
 }