Extract shell methods from ApplicationImpl into a base class, and pass this to Initialize() instead.

mash/example/views_examples/views_examples_application_delegate.cc

Index: mash/example/views_examples/views_examples_application_delegate.cc
diff --git a/mash/example/views_examples/views_examples_application_delegate.cc b/mash/example/views_examples/views_examples_application_delegate.cc
index 4132e405d1167a734e300c5c0f18c593fba4a3bf..dc675ab318b35c79f6a463634eed2aa13eb02b45 100644
--- a/mash/example/views_examples/views_examples_application_delegate.cc
+++ b/mash/example/views_examples/views_examples_application_delegate.cc
@@ -5,7 +5,7 @@
 #include "mash/example/views_examples/views_examples_application_delegate.h"
 
 #include "mojo/shell/public/cpp/application_connection.h"
-#include "mojo/shell/public/cpp/application_impl.h"
+#include "mojo/shell/public/cpp/shell.h"
 #include "ui/views/examples/example_base.h"
 #include "ui/views/examples/examples_window.h"
 #include "ui/views/mus/aura_init.h"
@@ -16,11 +16,13 @@ ViewsExamplesApplicationDelegate::ViewsExamplesApplicationDelegate() {}
 ViewsExamplesApplicationDelegate::~ViewsExamplesApplicationDelegate() {
 }
 
-void ViewsExamplesApplicationDelegate::Initialize(mojo::ApplicationImpl* app) {
-  tracing_.Initialize(app);
-  aura_init_.reset(new views::AuraInit(app, "views_mus_resources.pak"));
+void ViewsExamplesApplicationDelegate::Initialize(mojo::Shell* shell,
+                                                  const std::string& url,
+                                                  uint32_t id) {
+  tracing_.Initialize(shell, url);
+  aura_init_.reset(new views::AuraInit(shell, "views_mus_resources.pak"));
 
-  views::WindowManagerConnection::Create(app);
+  views::WindowManagerConnection::Create(shell);
 
   views::examples::ShowExamplesWindow(views::examples::DO_NOTHING_ON_CLOSE,
                                       nullptr, nullptr);