[MediaGalleries] Add context menu for forgetting galleries. [views]

chrome/browser/media_galleries/media_galleries_dialog_controller.h

Index: chrome/browser/media_galleries/media_galleries_dialog_controller.h
diff --git a/chrome/browser/media_galleries/media_galleries_dialog_controller.h b/chrome/browser/media_galleries/media_galleries_dialog_controller.h
index cc44f0c977b84798236c2b1ecee5469b099151bc..209d390cd04b83e2698c976ec7cc2c60a4e2e6a5 100644
--- a/chrome/browser/media_galleries/media_galleries_dialog_controller.h
+++ b/chrome/browser/media_galleries/media_galleries_dialog_controller.h
@@ -72,6 +72,9 @@ class MediaGalleriesDialogController
   // Header for unattached devices part of the dialog.
   string16 GetUnattachedLocationsHeader() const;
 
+  // Get the text of the forget context menu command.
+  string16 GetForgetMenuCommand() const;
+
   // Initial state of whether the dialog's confirmation button will be enabled.
   bool HasPermittedGalleries() const;
 
@@ -91,6 +94,9 @@ class MediaGalleriesDialogController
   virtual void DidToggleNewGallery(const MediaGalleryPrefInfo& gallery,
                                    bool enabled);
 
+  // The forget command in the context menu was selected.
+  virtual void DidForgetGallery(MediaGalleryPrefId pref_id);
+
   // The dialog is being deleted.
   virtual void DialogFinished(bool accepted);