Mac: Remove some remaining 10.6 logic for absent overlay scrollbar APIs

third_party/WebKit/Source/platform/scroll/ScrollbarThemeMac.mm

 /*
  * Copyright (C) 2008, 2011 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 193 matching lines @@
 
 ScrollbarThemeMac::~ScrollbarThemeMac()
 {
 }
 
 void ScrollbarThemeMac::preferencesChanged(float initialButtonDelay, float autoscrollButtonDelay, NSScrollerStyle preferredScrollerStyle, bool redraw, WebScrollbarButtonsPlacement buttonPlacement)
 {
     updateButtonPlacement(buttonPlacement);
     gInitialButtonDelay = initialButtonDelay;
     gAutoscrollButtonDelay = autoscrollButtonDelay;
-    bool sendScrollerStyleNotification = gPreferredScrollerStyle != preferredScrollerStyle;
     gPreferredScrollerStyle = preferredScrollerStyle;
     if (redraw && !scrollbarSet().isEmpty()) {
         ScrollbarSet::iterator end = scrollbarSet().end();
         for (ScrollbarSet::iterator it = scrollbarSet().begin(); it != end; ++it) {
             (*it)->styleChanged();
             (*it)->invalidate();
         }
     }
-    if (sendScrollerStyleNotification) {
-        [[NSNotificationCenter defaultCenter]
-            postNotificationName:@"NSPreferredScrollerStyleDidChangeNotification"
-                          object:nil
-                        userInfo:@{ @"NSScrollerStyle" : @(gPreferredScrollerStyle) }];
-    }
 }
 
 double ScrollbarThemeMac::initialAutoscrollTimerDelay()
 {
     return gInitialButtonDelay;
 }
 
 double ScrollbarThemeMac::autoscrollTimerDelay()
 {
     return gAutoscrollButtonDelay;
@@ skipping 196 matching lines @@
 
 // static
 NSScrollerStyle ScrollbarThemeMac::recommendedScrollerStyle()
 {
     if (RuntimeEnabledFeatures::overlayScrollbarsEnabled())
         return NSScrollerStyleOverlay;
     return gPreferredScrollerStyle;
 }
 
 } // namespace blink