AppListController refactoring part 3: Switching over to use AppListShower in Ash.

ash/shell_delegate.h

Index: ash/shell_delegate.h
diff --git a/ash/shell_delegate.h b/ash/shell_delegate.h
index 4a17a7692f25a909f35dc1d87996d2c3a6ee5d16..922462900a1c569a59da7d14f451e670be510f80 100644
--- a/ash/shell_delegate.h
+++ b/ash/shell_delegate.h
@@ -15,6 +15,7 @@
 class GURL;
 
 namespace app_list {
+class AppListShower;
 class AppListViewDelegate;
 }
 
@@ -112,9 +113,8 @@ class ASH_EXPORT ShellDelegate {
   // Opens the |url| in a new browser tab.
   virtual void OpenUrl(const GURL& url) = 0;
 
-  // Get the AppListViewDelegate, creating one if it does not yet exist.
-  // Ownership stays with Chrome's AppListService, or the ShellDelegate.
-  virtual app_list::AppListViewDelegate* GetAppListViewDelegate() = 0;
+  // Get the AppListShower. Ownership stays with Chrome.
+  virtual app_list::AppListShower* GetAppListShower() = 0;
 
   // Creates a new ShelfDelegate. Shell takes ownership of the returned
   // value.