[Experimental] Implement some part of custom properties in style maps

third_party/WebKit/Source/core/css/cssom/InlineStylePropertyMap.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 InlineStylePropertyMap_h
 #define InlineStylePropertyMap_h
 
 #include "core/css/cssom/MutableStylePropertyMap.h"
 #include "core/dom/Element.h"
 
@@ skipping 17 matching lines @@
               ExceptionState&) override;
   void remove(CSSPropertyID, ExceptionState&) override;
 
   DEFINE_INLINE_VIRTUAL_TRACE() {
     visitor->trace(m_ownerElement);
     MutableStylePropertyMap::trace(visitor);
   }
 
  protected:
   CSSStyleValueVector getAllInternal(CSSPropertyID) override;
-  CSSStyleValueVector getAllInternal(AtomicString customPropertyName) override;
+  CSSStyleValueVector getAllInternal(String customPropertyName) override;
 
   HeapVector<StylePropertyMapEntry> getIterationEntries() override;
 
  private:
   Member<Element> m_ownerElement;
 };
 
 }  // namespace blink
 
 #endif