Move Iterable.h and Maplike.h to bindings/core/v8/

Source/core/dom/Maplike.h

-// Copyright 2015 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 Maplike_h
-#define Maplike_h
-
-#include "bindings/core/v8/ScriptValue.h"
-#include "bindings/core/v8/ToV8.h"
-#include "core/dom/Iterable.h"
-
-namespace blink {
-
-template <typename KeyType, typename ValueType>
-class Maplike : public PairIterable<KeyType, ValueType> {
-public:
-    bool hasForBinding(ScriptState* scriptState, const KeyType& key, ExceptionState& exceptionState)
-    {
-        ValueType value;
-        return getMapEntry(scriptState, key, value, exceptionState);
-    }
-
-    ScriptValue getForBinding(ScriptState* scriptState, const KeyType& key, ExceptionState& exceptionState)
-    {
-        ValueType value;
-        if (getMapEntry(scriptState, key, value, exceptionState))
-            return ScriptValue(scriptState, toV8(value, scriptState->context()->Global(), scriptState->isolate()));
-        return ScriptValue(scriptState, v8::Undefined(scriptState->isolate()));
-    }
-
-private:
-    virtual bool getMapEntry(ScriptState*, const KeyType&, ValueType&, ExceptionState&) = 0;
-};
-
-} // namespace blink
-
-#endif // Maplike_h