Rewrite references to "wtf/" to "platform/wtf/" in //mojo.

mojo/public/cpp/bindings/array_traits_wtf_vector.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 MOJO_PUBLIC_CPP_BINDINGS_ARRAY_TRAITS_WTF_VECTOR_H_
 #define MOJO_PUBLIC_CPP_BINDINGS_ARRAY_TRAITS_WTF_VECTOR_H_
 
 #include "mojo/public/cpp/bindings/array_traits.h"
-#include "third_party/WebKit/Source/wtf/Vector.h"
+#include "third_party/WebKit/Source/platform/wtf/Vector.h"
 
 namespace mojo {
 
 template <typename U>
 struct ArrayTraits<WTF::Vector<U>> {
   using Element = U;
 
   static bool IsNull(const WTF::Vector<U>& input) {
     // WTF::Vector<> is always converted to non-null mojom array.
     return false;
@@ skipping 18 matching lines @@
 
   static bool Resize(WTF::Vector<U>& input, size_t size) {
     input.Resize(size);
     return true;
   }
 };
 
 }  // namespace mojo
 
 #endif  // MOJO_PUBLIC_CPP_BINDINGS_ARRAY_TRAITS_WTF_VECTOR_H_