Move preferred scrollbar style preference change listening from renderer to browser, 3 of 3.

Source/web/mac/WebScrollbarTheme.cpp

-/*
- * Copyright (C) 2013 Google Inc. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are
- * met:
- *
- *     * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
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- * in the documentation and/or other materials provided with the
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- * this software without specific prior written permission.
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- */
-
-#include "config.h"
-#include "WebScrollbarTheme.h"
-
-#include "platform/scroll/ScrollbarThemeMacCommon.h"
-
-using namespace WebCore;
-
-namespace blink {
-
-#if defined(MAC_OS_X_VERSION_10_7) && MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_7
-// TODO(rsesek): Reenable this after making sure it actually builds.
-//COMPILE_ASSERT(ScrollerStyleLegacy == NSScrollerStyleLegacy, ScrollerStyle_Legacy_must_be_equal);
-//COMPILE_ASSERT(ScrollerStyleOverlay == NSScrollerStyleOverlay, ScrollerStyle_Overlay_must_be_equal);
-#endif
-
-void WebScrollbarTheme::updateScrollbars(
-    float initialButtonDelay, float autoscrollButtonDelay,
-    bool jumpOnTrackClick, bool redraw)
-{
-    ScrollbarTheme* theme = ScrollbarTheme::theme();
-    if (theme->isMockTheme())
-        return;
-
-    static_cast<ScrollbarThemeMacCommon*>(ScrollbarTheme::theme())->preferencesChanged(
-        initialButtonDelay, autoscrollButtonDelay, jumpOnTrackClick, redraw);
-}
-
-void WebScrollbarTheme::updateScrollbars(
-    float initialButtonDelay, float autoscrollButtonDelay,
-    bool jumpOnTrackClick, ScrollerStyle preferredScrollerStyle, bool redraw)
-{
-    updateScrollbars(initialButtonDelay, autoscrollButtonDelay, jumpOnTrackClick, redraw);
-}
-
-} // namespace blink