Revert of Deletes mojo::Callback

third_party/WebKit/Source/platform/mojo/MojoHelper.h

 // Copyright 2016 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 MojoHelper_h
 #define MojoHelper_h
 
 #include "base/bind.h"
+#include "mojo/public/cpp/bindings/callback.h"
 #include "mojo/public/cpp/bindings/wtf_array.h"
 #include "platform/heap/HeapAllocator.h"
 #include <utility>
 
 namespace blink {
 
 namespace internal {
 
 template <typename R, typename... Args>
 R CallWTFFunction(Function<R(Args...)>* functor, Args... args)
@@ skipping 29 matching lines @@
         WTFArray<T> result(input.size());
         for (size_t i = 0; i < input.size(); ++i)
             result[i] = TypeConverter<T, E>::Convert(input[i]);
         return std::move(result);
     }
 };
 
 } // namespace mojo
 
 #endif // MojoHelper_h