Use mojo app list interfaces for mash and classic ash.

ash/common/shell_delegate.h

Index: ash/common/shell_delegate.h
diff --git a/ash/common/shell_delegate.h b/ash/common/shell_delegate.h
index c0070862436e66c84f2f0f2ce7ad4310ee4d3403..f584cf75cf51036bb3b4d3999225fadb71aecb60 100644
--- a/ash/common/shell_delegate.h
+++ b/ash/common/shell_delegate.h
@@ -14,10 +14,6 @@
 
 class GURL;
 
-namespace app_list {
-class AppListPresenter;
-}
-
 namespace gfx {
 class Image;
 }
@@ -93,11 +89,7 @@ class ASH_EXPORT ShellDelegate {
   // Opens the |url| in a new browser tab.
   virtual void OpenUrlFromArc(const GURL& url) = 0;
 
-  // Get the AppListPresenter. Ownership stays with Chrome.
-  virtual app_list::AppListPresenter* GetAppListPresenter() = 0;
-
-  // Creates a new ShelfDelegate. Shell takes ownership of the returned
-  // value.
+  // Creates a new ShelfDelegate. Shell takes ownership of the returned value.
   virtual ShelfDelegate* CreateShelfDelegate(ShelfModel* model) = 0;
 
   // Creates a system-tray delegate. Shell takes ownership of the delegate.