Oilpan: fix build after r202549.

Source/core/inspector/LayoutEditor.cpp

 // 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.
 
 #include "config.h"
 #include "core/inspector/LayoutEditor.h"
 
 #include "core/css/CSSComputedStyleDeclaration.h"
 #include "core/css/CSSImportRule.h"
 #include "core/css/CSSMediaRule.h"
@@ skipping 193 matching lines @@
     , m_changingProperty(CSSPropertyInvalid)
     , m_propertyInitialValue(0)
     , m_isDirty(false)
     , m_matchedRules(m_cssAgent->matchedRulesList(element))
     , m_currentRuleIndex(m_matchedRules->length())
 {
 }
 
 LayoutEditor::~LayoutEditor()
 {
+}
+
+void LayoutEditor::dispose()
+{
     if (!m_isDirty)
         return;
 
     ErrorString errorString;
     m_domAgent->undo(&errorString);
 }
 
 DEFINE_TRACE(LayoutEditor)
 {
     visitor->trace(m_element);
@@ skipping 213 matching lines @@
     }
 
     CSSStyleDeclaration* style = currentStyleIsInline() ? m_element->style() : toCSSStyleRule(m_matchedRules->item(m_currentRuleIndex))->style();
 
     String errorString;
     m_cssAgent->setCSSPropertyValue(&errorString, m_element.get(), style, m_changingProperty, value, forceImportant);
     return errorString.isEmpty();
 }
 
 } // namespace blink