Remove the concept of user stylesheets.

Source/core/page/Page.h

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2013 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 164 matching lines @@
     float deviceScaleFactor() const { return m_deviceScaleFactor; }
     void setDeviceScaleFactor(float);
 
     // Page and FrameView both store a Pagination value. Page::pagination() is set only by API,
     // and FrameView::pagination() is set only by CSS. Page::pagination() will affect all
     // FrameViews in the page cache, but FrameView::pagination() only affects the current
     // FrameView.
     const Pagination& pagination() const { return m_pagination; }
     void setPagination(const Pagination&);
 
-    void userStyleSheetLocationChanged();
-    const String& userStyleSheet() const;
-
     void dnsPrefetchingStateChanged();
 
     static void allVisitedStateChanged(PageGroup*);
     static void visitedStateChanged(PageGroup*, LinkHash visitedHash);
 
     StorageNamespace* sessionStorage(bool optionalCreate = true);
 
     // Don't allow more than a certain number of frames in a page.
     // This seems like a reasonable upper bound, and otherwise mutually
     // recursive frameset pages can quickly bring the program to its knees
@@ skipping 71 matching lines @@
     bool m_openedByDOM;
 
     bool m_tabKeyCyclesThroughElements;
     bool m_defersLoading;
 
     float m_pageScaleFactor;
     float m_deviceScaleFactor;
 
     Pagination m_pagination;
 
-    String m_userStyleSheet;
-    bool m_didLoadUserStyleSheet;
-
     RefPtr<PageGroup> m_group;
 
     OwnPtr<StorageNamespace> m_sessionStorage;
 
     double m_timerAlignmentInterval;
 
     PageVisibilityState m_visibilityState;
 
     bool m_isCursorVisible;
 
 #ifndef NDEBUG
     bool m_isPainting;
 #endif
 
     const OwnPtr<PageConsole> m_console;
 
     HashSet<MultisamplingChangedObserver*> m_multisamplingChangedObservers;
 };
 
 } // namespace WebCore
 
 #endif // Page_h