Remove stylesheet injection from Blink.

Source/core/dom/StyleEngine.h

Index: Source/core/dom/StyleEngine.h
diff --git a/Source/core/dom/StyleEngine.h b/Source/core/dom/StyleEngine.h
index 5f0734787e1a8845f3569d208b563cba655d9e5e..96acb5f44c92002788935b0ba52906ecadd3472e 100644
--- a/Source/core/dom/StyleEngine.h
+++ b/Source/core/dom/StyleEngine.h
@@ -78,7 +78,6 @@ public:
     const WillBeHeapVector<RefPtrWillBeMember<CSSStyleSheet>>& activeAuthorStyleSheets() const;
 
     const WillBeHeapVector<RefPtrWillBeMember<CSSStyleSheet>>& documentAuthorStyleSheets() const { return m_authorStyleSheets; }
-    const WillBeHeapVector<RefPtrWillBeMember<CSSStyleSheet>>& injectedAuthorStyleSheets() const;
 
     const WillBeHeapVector<RefPtrWillBeMember<CSSStyleSheet>> activeStyleSheetsForInspector() const;
 
@@ -89,11 +88,6 @@ public:
     void modifiedStyleSheetCandidateNode(Node*);
     void setExitTransitionStylesheetsEnabled(bool);
 
-    void invalidateInjectedStyleSheetCache();
-    void updateInjectedStyleSheetCache() const;
-
-    void compatibilityModeChanged();
-
     void addAuthorSheet(PassRefPtrWillBeRawPtr<StyleSheetContents> authorSheet);
 
     void clearMediaQueryRuleSetStyleSheets();
@@ -267,9 +261,6 @@ private:
     // elements and when it is safe to execute scripts.
     int m_pendingStylesheets;
 
-    mutable WillBeHeapVector<RefPtrWillBeMember<CSSStyleSheet>> m_injectedAuthorStyleSheets;
-    mutable bool m_injectedStyleSheetCacheValid;
-
     WillBeHeapVector<RefPtrWillBeMember<CSSStyleSheet>> m_authorStyleSheets;
 
     OwnPtrWillBeMember<DocumentStyleSheetCollection> m_documentStyleSheetCollection;