Move application_manager's ShellImpl to own file

mojo/application_manager/shell_impl.h

Index: mojo/application_manager/shell_impl.h
diff --git a/mojo/application_manager/shell_impl.h b/mojo/application_manager/shell_impl.h
new file mode 100644
index 0000000000000000000000000000000000000000..ff35548e803e870ef74b9be01719f7103e38680d
--- /dev/null
+++ b/mojo/application_manager/shell_impl.h
@@ -0,0 +1,61 @@
+// Copyright 2015 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.
+
+#ifndef MOJO_APPLICATION_MANAGER_SHELL_IMPL_H_
+#define MOJO_APPLICATION_MANAGER_SHELL_IMPL_H_
+
+#include "mojo/public/cpp/bindings/binding.h"
+#include "mojo/public/cpp/bindings/error_handler.h"
+#include "mojo/public/interfaces/application/application.mojom.h"
+#include "mojo/public/interfaces/application/shell.mojom.h"
+#include "url/gurl.h"
+
+namespace mojo {
+class ApplicationManager;
+
+class ShellImpl : public Shell, public ErrorHandler {
+ public:
+  ShellImpl(ScopedMessagePipeHandle handle,
+            ApplicationManager* manager,
+            const GURL& requested_url,
+            const GURL& url);
+
+  ShellImpl(ShellPtr* ptr,
+            ApplicationManager* manager,
+            const GURL& requested_url,
+            const GURL& url);
+
+  ~ShellImpl() override;
+
+  void ConnectToClient(const GURL& requestor_url,
+                       ServiceProviderPtr service_provider);
+
+  Application* client() { return binding_.client(); }
+  const GURL& url() const { return url_; }
+  const GURL& requested_url() const { return requested_url_; }
+
+ private:
+  ShellImpl(ApplicationManager* manager,
+            const GURL& requested_url,
+            const GURL& url);
+
+  // Shell implementation:
+  void ConnectToApplication(
+      const String& app_url,
+      InterfaceRequest<ServiceProvider> in_service_provider) override;
+
+  // ErrorHandler implementation:
+  void OnConnectionError() override;
+
+  ApplicationManager* const manager_;
+  const GURL requested_url_;
+  const GURL url_;
+  Binding<Shell> binding_;
+
+  DISALLOW_COPY_AND_ASSIGN(ShellImpl);
+};
+
+}  // namespace mojo
+
+#endif  // MOJO_APPLICATION_MANAGER_SHELL_IMPL_H_