clang-format //shell and add a PRESUBMIT.py to keep it clang-formatted.

shell/dynamic_service_runner.h

 // Copyright 2014 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 SHELL_DYNAMIC_SERVICE_RUNNER_H_
 #define SHELL_DYNAMIC_SERVICE_RUNNER_H_
 
 #include "base/callback_forward.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/native_library.h"
@@ skipping 45 matching lines @@
   virtual ~DynamicServiceRunnerFactory() {}
   virtual scoped_ptr<DynamicServiceRunner> Create(Context* context) = 0;
 };
 
 // A generic factory.
 template <class DynamicServiceRunnerImpl>
 class DynamicServiceRunnerFactoryImpl : public DynamicServiceRunnerFactory {
  public:
   DynamicServiceRunnerFactoryImpl() {}
   virtual ~DynamicServiceRunnerFactoryImpl() {}
-  virtual scoped_ptr<DynamicServiceRunner> Create(Context* context) override {
+  scoped_ptr<DynamicServiceRunner> Create(Context* context) override {
     return scoped_ptr<DynamicServiceRunner>(
         new DynamicServiceRunnerImpl(context));
   }
 };
 
 }  // namespace shell
 }  // namespace mojo
 
 #endif  // SHELL_DYNAMIC_SERVICE_RUNNER_H_