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

Source/web/mac/WebScrollbarTheme.mm

 /*
  * 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.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 13 matching lines @@
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 #include "WebScrollbarTheme.h"
 
+#import <AppKit/AppKit.h>
+
 #include "platform/scroll/ScrollbarThemeMacCommon.h"
+#include "platform/mac/NSScrollerImpDetails.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
+COMPILE_ASSERT(ScrollerStyleLegacy == NSScrollerStyleLegacy, ScrollerStyle_Legacy_must_be_equal);
+COMPILE_ASSERT(ScrollerStyleOverlay == NSScrollerStyleOverlay, ScrollerStyle_Overlay_must_be_equal);
 
 void WebScrollbarTheme::updateScrollbars(
     float initialButtonDelay, float autoscrollButtonDelay,
-    bool jumpOnTrackClick, bool redraw)
+    bool jumpOnTrackClick, ScrollerStyle preferredScrollerStyle, 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);
+        initialButtonDelay, autoscrollButtonDelay, jumpOnTrackClick, preferredScrollerStyle, redraw);
 }
 
 } // namespace blink