Devtools [LayoutEditor]: Remove caching of the selector information

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/CSSRuleList.h"
 #include "core/dom/NodeComputedStyle.h"
@@ skipping 297 matching lines @@
 {
     ErrorString errorString;
     if (commitChanges)
         m_domAgent->markUndoableState(&errorString);
     else if (m_isDirty)
         m_domAgent->undo(&errorString);
 
     m_element.clear();
     m_isDirty = false;
     m_matchedRules.clear();
-    m_cachedSelectorsInfo.clear();
     m_currentRuleIndex = -1;
 }
 
 void LayoutEditor::initializeCSSRules()
 {
     if (!m_element)
         return;
 
     Document* ownerDocument = m_element->ownerDocument();
     // A non-active document has no styles.
@@ skipping 49 matching lines @@
         return;
 
     m_currentRuleIndex--;
 }
 
 String LayoutEditor::currentSelectorInfo()
 {
     if (!m_element)
         return String();
 
-    if (m_cachedSelectorsInfo.contains(m_currentRuleIndex))
-        return m_cachedSelectorsInfo.get(m_currentRuleIndex);
-
     RefPtr<JSONObject> object = JSONObject::create();
     String currentSelectorText = m_currentRuleIndex == -1 ? "inline style" : m_matchedRules[m_currentRuleIndex]->selectorText();
     object->setString("selector", currentSelectorText);
 
     Document* ownerDocument = m_element->ownerDocument();
     if (!ownerDocument->isActive() || m_currentRuleIndex == -1)
         return object->toJSONString();
 
     TrackExceptionState exceptionState;
     RefPtrWillBeRawPtr<StaticElementList> elements = ownerDocument->querySelectorAll(AtomicString(m_matchedRules[m_currentRuleIndex]->selectorText()), exceptionState);
 
     if (!elements || exceptionState.hadException())
         return object->toJSONString();
 
     RefPtr<JSONArray> highlights = JSONArray::create();
     InspectorHighlightConfig config = affectedNodesHighlightConfig();
     for (unsigned i = 0; i < elements->length(); ++i) {
         Element* element = elements->item(i);
         if (element == m_element)
             continue;
 
         InspectorHighlight highlight(element, config, false);
         highlights->pushObject(highlight.asJSONObject());
     }
 
     object->setArray("nodes", highlights.release());
-    m_cachedSelectorsInfo.add(m_currentRuleIndex, object->toJSONString());
-    return m_cachedSelectorsInfo.get(m_currentRuleIndex);
+    return object->toJSONString();
 }
 
 } // namespace blink