Migrate HostZoomMap to live in StoragePartition.

chrome/browser/ui/webui/options/content_settings_handler.cc

Index: chrome/browser/ui/webui/options/content_settings_handler.cc
diff --git a/chrome/browser/ui/webui/options/content_settings_handler.cc b/chrome/browser/ui/webui/options/content_settings_handler.cc
index 898cf5a14936f91673116c931004a70d1d218a9a..fb02fd457f8b1235eb756a928410abfdb20218c4 100644
--- a/chrome/browser/ui/webui/options/content_settings_handler.cc
+++ b/chrome/browser/ui/webui/options/content_settings_handler.cc
@@ -481,12 +481,15 @@ void ContentSettingsHandler::InitializeHandler() {
           &ContentSettingsHandler::UpdateProtectedContentExceptionsButton,
           base::Unretained(this)));
 
-  content::HostZoomMap* host_zoom_map =
-      content::HostZoomMap::GetForBrowserContext(context);
+  // Here we only subscribe to the HostZoomMap for the default storage partition
+  // since we don't allow the user to manage the zoom levels for apps.
+  // We're only interested in zoom-levels that are persisted, since the user
+  // is given the opportunity to view/delete these in the content-settings page.
   host_zoom_map_subscription_ =
-      host_zoom_map->AddZoomLevelChangedCallback(
-          base::Bind(&ContentSettingsHandler::OnZoomLevelChanged,
-                     base::Unretained(this)));
+      content::HostZoomMap::GetDefaultForBrowserContext(context)
+          ->AddZoomLevelChangedCallback(
+              base::Bind(&ContentSettingsHandler::OnZoomLevelChanged,
+                         base::Unretained(this)));
 
   flash_settings_manager_.reset(new PepperFlashSettingsManager(this, context));
   observer_.Add(Profile::FromWebUI(web_ui())->GetHostContentSettingsMap());
@@ -961,7 +964,8 @@ void ContentSettingsHandler::UpdateZoomLevelsExceptionsView() {
   base::ListValue zoom_levels_exceptions;
 
   content::HostZoomMap* host_zoom_map =
-      content::HostZoomMap::GetForBrowserContext(GetBrowserContext(web_ui()));
+      content::HostZoomMap::GetDefaultForBrowserContext(
+          GetBrowserContext(web_ui()));
   content::HostZoomMap::ZoomLevelVector zoom_levels(
       host_zoom_map->GetAllZoomLevels());
   std::sort(zoom_levels.begin(), zoom_levels.end(), HostZoomSort);
@@ -1214,7 +1218,8 @@ void ContentSettingsHandler::RemoveZoomLevelException(
   DCHECK(rv);
 
   content::HostZoomMap* host_zoom_map =
-      content::HostZoomMap::GetForBrowserContext(GetBrowserContext(web_ui()));
+      content::HostZoomMap::GetDefaultForBrowserContext(
+          GetBrowserContext(web_ui()));
   double default_level = host_zoom_map->GetDefaultZoomLevel();
   host_zoom_map->SetZoomLevelForHost(pattern, default_level);
 }