Make async waiter explicit MojoGLES2CreateContext param

mojo/services/view_manager/root_view_manager.h

Index: mojo/services/view_manager/root_view_manager.h
diff --git a/mojo/services/view_manager/root_view_manager.h b/mojo/services/view_manager/root_view_manager.h
index 8656d47b0d3ab96ab46d2979c596b33058b20cf0..366e86bd39f1617b30602fe31cd0e73ff2f68c98 100644
--- a/mojo/services/view_manager/root_view_manager.h
+++ b/mojo/services/view_manager/root_view_manager.h
@@ -10,7 +10,6 @@
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "mojo/public/cpp/bindings/callback.h"
-#include "mojo/public/cpp/gles2/gles2.h"
 #include "mojo/services/view_manager/view_manager_export.h"
 
 namespace aura {
@@ -53,8 +52,6 @@ class MOJO_VIEW_MANAGER_EXPORT RootViewManager {
 
   RootNodeManager* root_node_manager_;
 
-  GLES2Initializer gles_initializer_;
-
   // Returns true if adding the root node's window to |window_tree_host_|.
   bool in_setup_;