Move creation and ownership of HostZoomMap to content instead of having every embedder do this.

chrome/browser/profiles/profile_impl.h

Index: chrome/browser/profiles/profile_impl.h
===================================================================
--- chrome/browser/profiles/profile_impl.h	(revision 122827)
+++ chrome/browser/profiles/profile_impl.h	(working copy)
@@ -57,7 +57,6 @@
       int renderer_child_id) OVERRIDE;
   virtual net::URLRequestContextGetter* GetRequestContextForMedia() OVERRIDE;
   virtual content::ResourceContext* GetResourceContext() OVERRIDE;
-  virtual content::HostZoomMap* GetHostZoomMap() OVERRIDE;
   virtual content::GeolocationPermissionContext*
       GetGeolocationPermissionContext() OVERRIDE;
   virtual content::SpeechInputPreferences* GetSpeechInputPreferences() OVERRIDE;
@@ -232,7 +231,6 @@
   scoped_ptr<SSLConfigServiceManager> ssl_config_service_manager_;
 
   scoped_refptr<HostContentSettingsMap> host_content_settings_map_;
-  scoped_refptr<content::HostZoomMap> host_zoom_map_;
   scoped_refptr<content::GeolocationPermissionContext>
       geolocation_permission_context_;
   scoped_refptr<content::SpeechInputPreferences> speech_input_preferences_;