Change mojo demo apps to use Application.

mojo/examples/sample_app/sample_app.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <stdio.h>
 #include <string>
 
 #include "mojo/examples/sample_app/gles2_client_impl.h"
 #include "mojo/public/bindings/allocation_scope.h"
 #include "mojo/public/bindings/remote_ptr.h"
@@ skipping 17 matching lines @@
 #endif
 
 namespace mojo {
 namespace examples {
 
 class SampleApp : public Application, public mojo::NativeViewportClient {
  public:
   explicit SampleApp(MojoHandle shell_handle) : Application(shell_handle) {
     InterfacePipe<NativeViewport, AnyInterface> viewport_pipe;
     mojo::AllocationScope scope;
-    GetShell()->Connect("mojo:mojo_native_viewport_service",
-                        viewport_pipe.handle_to_peer.Pass());
+    shell()->Connect("mojo:mojo_native_viewport_service",
+                     viewport_pipe.handle_to_peer.Pass());
     viewport_.reset(viewport_pipe.handle_to_self.Pass(), this);
     Rect::Builder rect;
     Point::Builder point;
     point.set_x(10);
     point.set_y(10);
     rect.set_position(point.Finish());
     Size::Builder size;
     size.set_width(800);
     size.set_height(600);
     rect.set_size(size.Finish());
@@ skipping 39 matching lines @@
 extern "C" SAMPLE_APP_EXPORT MojoResult CDECL MojoMain(
     MojoHandle shell_handle) {
   mojo::Environment env;
   mojo::RunLoop loop;
   mojo::GLES2Initializer gles2;
 
   mojo::examples::SampleApp app(shell_handle);
   loop.Run();
   return MOJO_RESULT_OK;
 }