Migrate HostZoomMap to live in StoragePartition.

content/browser/host_zoom_map_impl.h

Index: content/browser/host_zoom_map_impl.h
diff --git a/content/browser/host_zoom_map_impl.h b/content/browser/host_zoom_map_impl.h
index 821fa0e4923e7bc9caaa5548a7592cb2cc0994a5..867e744911b3cce6a8a98cddee153d252c4eda74 100644
--- a/content/browser/host_zoom_map_impl.h
+++ b/content/browser/host_zoom_map_impl.h
@@ -17,6 +17,10 @@
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 
+namespace base {
+class DictionaryValue;
+}
+
 namespace content {
 
 class WebContentsImpl;
@@ -24,10 +28,9 @@ class WebContentsImpl;
 // HostZoomMap needs to be deleted on the UI thread because it listens
 // to notifications on there (and holds a NotificationRegistrar).
 class CONTENT_EXPORT HostZoomMapImpl : public NON_EXPORTED_BASE(HostZoomMap),
-                                       public NotificationObserver,
-                                       public base::SupportsUserData::Data {
+                                       public NotificationObserver {
  public:
-  HostZoomMapImpl();
+  explicit HostZoomMapImpl(double default_zoom_level);
   virtual ~HostZoomMapImpl();
 
   // HostZoomMap implementation:
@@ -59,6 +62,12 @@ class CONTENT_EXPORT HostZoomMapImpl : public NON_EXPORTED_BASE(HostZoomMap),
   virtual scoped_ptr<Subscription> AddZoomLevelChangedCallback(
       const ZoomLevelChangedCallback& callback) OVERRIDE;
 
+  // Returns a dictionary of ZoomLevels. Schemes are stripped away, but
+  // scheme+host zoom levels are included. Caller assumes ownership of the
+  // returned pointer.
+  // TODO(wjmaclean) Should we return an owned pointer here?
+  scoped_ptr<base::DictionaryValue> ZoomLevelDictionary() const;
+
   // Returns the current zoom level for the specified WebContents. This may
   // be a temporary zoom level, depending on UsesTemporaryZoomLevel().
   double GetZoomLevelForWebContents(