Include mojo/public/cpp/bindings/binding.h wherever mojo::Binding<> is used.

sky/viewer/internals.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 SKY_VIEWER_INTERNALS_H_
 #define SKY_VIEWER_INTERNALS_H_
 
 #include "base/memory/weak_ptr.h"
 #include "base/supports_user_data.h"
 #include "dart/runtime/include/dart_api.h"
+#include "mojo/public/cpp/bindings/binding.h"
 #include "mojo/public/interfaces/application/shell.mojom.h"
 #include "sky/services/testing/test_harness.mojom.h"
 
 namespace sky {
 class DocumentView;
 
 class Internals : public base::SupportsUserData::Data,
                   public mojo::Shell {
  public:
   ~Internals() override;
@@ skipping 19 matching lines @@
   base::WeakPtr<DocumentView> document_view_;
   mojo::Binding<mojo::Shell> shell_binding_;
   TestHarnessPtr test_harness_;
 
   MOJO_DISALLOW_COPY_AND_ASSIGN(Internals);
 };
 
 }  // namespace sky
 
 #endif  // SKY_VIEWER_INTERNALS_H_