Forward declare ShellClient for MojoApplicationInfo

content/public/common/mojo_application_info.h

 // 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 CONTENT_PUBLIC_COMMON_MOJO_APPLICATION_INFO_H_
 #define CONTENT_PUBLIC_COMMON_MOJO_APPLICATION_INFO_H_
 
 #include <memory>
 
-#include "base/callback_forward.h"
+#include "base/callback.h"
 #include "base/memory/ref_counted.h"
+#include "base/single_thread_task_runner.h"
 #include "content/common/content_export.h"
-#include "services/shell/public/cpp/shell_client.h"
 
-namespace base {
-class SingleThreadTaskRunner;
-}  // namespace base
+namespace shell {
+class ShellClient;
+}
 
 namespace content {
 
 // MojoApplicationInfo provides details necessary to construct and bind new
 // instances of embedded Mojo applications.
 struct CONTENT_EXPORT MojoApplicationInfo {
   using ApplicationFactory = base::Callback<std::unique_ptr<shell::ShellClient>(
       const base::Closure& quit_closure)>;
 
   MojoApplicationInfo();
@@ skipping 13 matching lines @@
   // each instance of this app its own thread to run on. Setting this to |false|
   // (the default) will instead run the app on the main thread's task runner.
   //
   // If |application_task_runner| is not null, this value is ignored.
   bool use_own_thread = false;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_COMMON_MOJO_APPLICATION_INFO_H_