Avoid to include IDL-generated headers from EventTarget.h and Node.h

third_party/WebKit/Source/core/html/HTMLIFrameElementAllow.cpp

 // Copyright 2017 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.
 
 #include "core/html/HTMLIFrameElementAllow.h"
 
 #include "core/html/HTMLIFrameElement.h"
 #include "platform/feature_policy/FeaturePolicy.h"
+#include "wtf/text/StringBuilder.h"
 
 using blink::WebFeaturePolicyFeature;
 
 namespace blink {
 
 HTMLIFrameElementAllow::HTMLIFrameElementAllow(HTMLIFrameElement* element)
     : DOMTokenList(this), m_element(element) {}
 
 HTMLIFrameElementAllow::~HTMLIFrameElementAllow() {}
 
@@ skipping 43 matching lines @@
   return getWebFeaturePolicyFeature(tokenValue.getString()) !=
          WebFeaturePolicyFeature::NotFound;
 }
 
 void HTMLIFrameElementAllow::valueWasSet() {
   DCHECK(m_element);
   m_element->allowValueWasSet();
 }
 
 }  // namespace blink