Make PlatformViewport and NativeViewportImpl use Shell* instead of ApplicationImpl*.

services/native_viewport/platform_viewport_x11.cc

Index: services/native_viewport/platform_viewport_x11.cc
diff --git a/services/native_viewport/platform_viewport_x11.cc b/services/native_viewport/platform_viewport_x11.cc
index c77f413e4fc42819e7a703788c5f7f97a9c4f06f..46131eb594507783b4def580a703c251ec230453 100644
--- a/services/native_viewport/platform_viewport_x11.cc
+++ b/services/native_viewport/platform_viewport_x11.cc
@@ -162,9 +162,8 @@ class PlatformViewportX11 : public PlatformViewport,
 };
 
 // static
-scoped_ptr<PlatformViewport> PlatformViewport::Create(
-    mojo::ApplicationImpl* application_,
-    Delegate* delegate) {
+scoped_ptr<PlatformViewport> PlatformViewport::Create(mojo::Shell* shell,
+                                                      Delegate* delegate) {
   return make_scoped_ptr(new PlatformViewportX11(delegate));
 }