content: convert zoom notifications to observer usage

chrome/browser/profiles/off_the_record_profile_impl.h

Index: chrome/browser/profiles/off_the_record_profile_impl.h
diff --git a/chrome/browser/profiles/off_the_record_profile_impl.h b/chrome/browser/profiles/off_the_record_profile_impl.h
index 0da387471948fbbeb34673d42026aca56bce148b..386ab06ce5e9a26bfa234a4435de81e48bb6452e 100644
--- a/chrome/browser/profiles/off_the_record_profile_impl.h
+++ b/chrome/browser/profiles/off_the_record_profile_impl.h
@@ -11,8 +11,6 @@
 #include "chrome/browser/profiles/off_the_record_profile_io_data.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/browser_list.h"
-#include "content/public/browser/notification_observer.h"
-#include "content/public/browser/notification_registrar.h"
 
 using base::Time;
 using base::TimeDelta;
@@ -26,8 +24,7 @@ using base::TimeDelta;
 // Providing this header file is for unit testing.
 //
 ////////////////////////////////////////////////////////////////////////////////
-class OffTheRecordProfileImpl : public Profile,
-                                public content::NotificationObserver {
+class OffTheRecordProfileImpl : public Profile {
  public:
   explicit OffTheRecordProfileImpl(Profile* real_profile);
   virtual ~OffTheRecordProfileImpl();
@@ -105,10 +102,7 @@ class OffTheRecordProfileImpl : public Profile,
       GetSpeechRecognitionPreferences() OVERRIDE;
   virtual quota::SpecialStoragePolicy* GetSpecialStoragePolicy() OVERRIDE;
 
-  // content::NotificationObserver implementation.
-  virtual void Observe(int type,
-                       const content::NotificationSource& source,
-                       const content::NotificationDetails& details) OVERRIDE;
+  void OnZoomLevelChanged(const std::string& host);
 
  private:
   FRIEND_TEST_ALL_PREFIXES(OffTheRecordProfileImplTest, GetHostZoomMap);
@@ -121,8 +115,6 @@ class OffTheRecordProfileImpl : public Profile,
   virtual base::Callback<ChromeURLDataManagerBackend*(void)>
       GetChromeURLDataManagerBackendGetter() const OVERRIDE;
 
-  content::NotificationRegistrar registrar_;
-
   // The real underlying profile.
   Profile* profile_;