Devtools [LayoutEditor]: Remove caching of the selector information

Source/core/inspector/LayoutEditor.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 LayoutEditor_h
 #define LayoutEditor_h
 
 #include "core/CSSPropertyNames.h"
 #include "core/CoreExport.h"
 #include "core/css/CSSPrimitiveValue.h"
@@ skipping 43 matching lines @@
     RefPtrWillBeMember<Element> m_element;
     RawPtrWillBeMember<InspectorCSSAgent> m_cssAgent;
     RawPtrWillBeMember<InspectorDOMAgent> m_domAgent;
     CSSPropertyID m_changingProperty;
     float m_propertyInitialValue;
     float m_factor;
     CSSPrimitiveValue::UnitType m_valueUnitType;
     bool m_isDirty;
 
     WillBeHeapVector<RefPtrWillBeMember<CSSStyleRule>> m_matchedRules;
-    HashMap<int, String> m_cachedSelectorsInfo;
     // -1 means "inline style".
     int m_currentRuleIndex;
 };
 
 } // namespace blink
 
 
 #endif // !defined(LayoutEditor_h)