Remove unused StyleElement::clearDocumentData().

Review-Url: https://codereview.chromium.org/2350743002
Cr-Commit-Position: refs/heads/master@{#419556}

third_party/WebKit/Source/core/dom/StyleElement.cpp

@@ -105,18 +105,6 @@ void StyleElement::removedFrom(Element* element, ContainerNode* insertionPoint)
         document.styleEngine().setNeedsActiveStyleUpdate(removedSheet, AnalyzedStyleUpdate);
 }
 
-void StyleElement::clearDocumentData(Document& document, Element* element)
-{
-    if (m_sheet)
-        m_sheet->clearOwnerNode();
-
-    if (m_registeredAsCandidate) {
-        DCHECK(element->isConnected());
-        document.styleEngine().removeStyleSheetCandidateNode(element, element->treeScope());
-        m_registeredAsCandidate = false;
-    }
-}
-
 StyleElement::ProcessingResult StyleElement::childrenChanged(Element* element)
 {
     DCHECK(element);

third_party/WebKit/Source/core/dom/StyleElement.h

@@ -54,7 +54,6 @@ protected:
 
     void insertedInto(Element*, ContainerNode* insertionPoint);
     void removedFrom(Element*, ContainerNode* insertionPoint);
-    void clearDocumentData(Document&, Element*);
     ProcessingResult processStyleSheet(Document&, Element*);
     ProcessingResult childrenChanged(Element*);
     ProcessingResult finishParsingChildren(Element*);