Introduce ChromeZoomLevelPref, make zoom level prefs independent of profile prefs.

chrome/browser/profiles/profile_impl.h

Index: chrome/browser/profiles/profile_impl.h
diff --git a/chrome/browser/profiles/profile_impl.h b/chrome/browser/profiles/profile_impl.h
index 6545b385f11f293c7499711c97ca3f284df4832c..2afa3499f23155c264025f300db332b6dd4db2f1 100644
--- a/chrome/browser/profiles/profile_impl.h
+++ b/chrome/browser/profiles/profile_impl.h
@@ -19,6 +19,7 @@
 #include "chrome/browser/profiles/profile_impl_io_data.h"
 #include "content/public/browser/content_browser_client.h"
 #include "content/public/browser/host_zoom_map.h"
+#include "content/public/browser/zoom_level_prefs_store.h"
 
 class NetPrefObserver;
 class PrefService;
@@ -111,6 +112,7 @@ class ProfileImpl : public Profile {
   virtual ExtensionSpecialStoragePolicy*
       GetExtensionSpecialStoragePolicy() OVERRIDE;
   virtual PrefService* GetPrefs() OVERRIDE;
+  virtual PrefService* GetZoomLevelPrefs() OVERRIDE;
   virtual PrefService* GetOffTheRecordPrefs() OVERRIDE;
   virtual net::URLRequestContextGetter*
       GetRequestContextForExtensions() OVERRIDE;
@@ -172,12 +174,10 @@ class ProfileImpl : public Profile {
   // Does final initialization. Should be called after prefs were loaded.
   void DoFinalInit();
 
+  // TODO(wjmaclean): Delete this once the HostZoomMap moves to
+  // StoragePartition.
   void InitHostZoomMap();
 
-  void OnDefaultZoomLevelChanged();
-  void OnZoomLevelChanged(
-      const content::HostZoomMap::ZoomLevelChange& change);
-
   // Does final prefs initialization and calls Init().
   void OnPrefsLoaded(bool success);
 
@@ -208,7 +208,9 @@ class ProfileImpl : public Profile {
   scoped_ptr<domain_reliability::DomainReliabilityMonitor>
       CreateDomainReliabilityMonitor(PrefService* local_state);
 
-  scoped_ptr<content::HostZoomMap::Subscription> zoom_subscription_;
+  // TODO(wjmaclean): This is only here temporarily until HostZoomMap moves
+  // into StoragePartition, after which it will also move to StoragePartition.
+  scoped_ptr<content::ZoomLevelPrefsStore> zoom_level_prefs_store_;
   PrefChangeRegistrar pref_change_registrar_;
 
   base::FilePath path_;