DevTools: Remove InspectorDOMAgent::m_idToNodesMap entries correctly.

Source/core/inspector/InspectorDOMAgent.cpp

Index: Source/core/inspector/InspectorDOMAgent.cpp
diff --git a/Source/core/inspector/InspectorDOMAgent.cpp b/Source/core/inspector/InspectorDOMAgent.cpp
index 376ad6b3f13ac57ca389cad4c81741adce9a799f..fd81491202f257d06e25b581b09125d78c23507b 100644
--- a/Source/core/inspector/InspectorDOMAgent.cpp
+++ b/Source/core/inspector/InspectorDOMAgent.cpp
@@ -346,6 +346,7 @@ void InspectorDOMAgent::unbind(Node* node, NodeToIdMap* nodesMap)
         return;
 
     m_idToNode.remove(id);
+    m_idToNodesMap.remove(id);
 
     if (node->isFrameOwnerElement()) {
         Document* contentDocument = toHTMLFrameOwnerElement(node)->contentDocument();
@@ -557,6 +558,7 @@ void InspectorDOMAgent::discardFrontendBindings()
     m_searchResults.clear();
     m_documentNodeToIdMap.clear();
     m_idToNode.clear();
+    m_idToNodesMap.clear();
     releaseDanglingNodes();
     m_childrenRequested.clear();
     m_cachedChildCount.clear();