[Variables] Enable get/setProperty and similar APIs from the CSSOM

third_party/WebKit/Source/core/editing/commands/RemoveCSSPropertyCommand.cpp

 /*
  * Copyright (C) 2005, 2008 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 40 matching lines @@
 {
     const StylePropertySet* style = m_element->inlineStyle();
     if (!style)
         return;
 
     m_oldValue = style->getPropertyValue(m_property);
     m_important = style->propertyIsImportant(m_property);
 
     // Mutate using the CSSOM wrapper so we get the same event behavior as a script.
     // Setting to null string removes the property. We don't have internal version of removeProperty.
-    m_element->style()->setPropertyInternal(m_property, String(), false, IGNORE_EXCEPTION);
+    m_element->style()->setPropertyInternal(m_property, String(), String(), false, IGNORE_EXCEPTION);
 }
 
 void RemoveCSSPropertyCommand::doUnapply()
 {
-    m_element->style()->setPropertyInternal(m_property, m_oldValue, m_important, IGNORE_EXCEPTION);
+    m_element->style()->setPropertyInternal(m_property, String(), m_oldValue, m_important, IGNORE_EXCEPTION);
 }
 
 DEFINE_TRACE(RemoveCSSPropertyCommand)
 {
     visitor->trace(m_element);
     SimpleEditCommand::trace(visitor);
 }
 
 } // namespace blink