Remove unused typemap includes from generated C++ mojo bindings.

mojo/public/cpp/bindings/lib/wtf_clone_equals_util.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_LIB_WTF_CLONE_EQUALS_UTIL_H_
 #define MOJO_PUBLIC_CPP_BINDINGS_LIB_WTF_CLONE_EQUALS_UTIL_H_
 
 #include <type_traits>
 
 #include "mojo/public/cpp/bindings/lib/clone_equals_util.h"
 #include "third_party/WebKit/Source/wtf/HashMap.h"
 #include "third_party/WebKit/Source/wtf/Optional.h"
 #include "third_party/WebKit/Source/wtf/Vector.h"
 #include "third_party/WebKit/Source/wtf/text/WTFString.h"
 
 namespace mojo {
 namespace internal {
 
 template <typename T>
 struct CloneTraits<WTF::Vector<T>, false> {
   static WTF::Vector<T> Clone(const WTF::Vector<T>& input) {
     WTF::Vector<T> result;
     result.reserveCapacity(input.size());
     for (const auto& element : input)
-      result.append(internal::Clone(element));
+      result.push_back(internal::Clone(element));
 
     return result;
   }
 };
 
 template <typename K, typename V>
 struct CloneTraits<WTF::HashMap<K, V>, false> {
   static WTF::HashMap<K, V> Clone(const WTF::HashMap<K, V>& input) {
     WTF::HashMap<K, V> result;
     auto input_end = input.end();
@@ skipping 31 matching lines @@
         return false;
     }
     return true;
   }
 };
 
 }  // namespace internal
 }  // namespace mojo
 
 #endif  // MOJO_PUBLIC_CPP_BINDINGS_LIB_WTF_CLONE_EQUALS_UTIL_H_