mac: Remove IsOSLion().

ui/app_list/cocoa/scroll_view_with_no_scrollbars.mm

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/app_list/cocoa/scroll_view_with_no_scrollbars.h"
 
 #include "base/mac/mac_util.h"
 #include "base/mac/scoped_cftyperef.h"
 #include "base/mac/scoped_nsobject.h"
 #include "base/mac/sdk_forward_declarations.h"
@@ skipping 11 matching lines @@
 }
 
 @end
 
 @implementation ScrollViewWithNoScrollbars
 
 @synthesize delegate = delegate_;
 
 - (id)initWithFrame:(NSRect)frame {
   if ((self = [super initWithFrame:frame])) {
-    [self setHasHorizontalScroller:base::mac::IsOSLionOrLater()];
+    [self setHasHorizontalScroller:YES];
     NSRect horizontalScrollerRect = [self bounds];
     horizontalScrollerRect.size.height = 0;
     base::scoped_nsobject<InvisibleScroller> horizontalScroller(
         [[InvisibleScroller alloc] initWithFrame:horizontalScrollerRect]);
     [self setHorizontalScroller:horizontalScroller];
   }
   return self;
 }
 
-- (void)endGestureWithEvent:(NSEvent*)event {
-  [super endGestureWithEvent:event];
-  if (!base::mac::IsOSLionOrLater())
-    [delegate_ userScrolling:NO];
-}
-
 - (void)scrollWheel:(NSEvent*)event {
   if ([event subtype] == NSMouseEventSubtype) {
     // Since the scroll view has no vertical scroller, regular up and down mouse
     // wheel events would be ignored. This maps mouse wheel events to a
     // horizontal scroll event of one line, to turn pages.
     BOOL downOrRight;
     if ([event deltaX] != 0)
       downOrRight = [event deltaX] > 0;
     else if ([event deltaY] != 0)
       downOrRight = [event deltaY] > 0;
@@ skipping 11 matching lines @@
     return;
 
   BOOL scrollComplete = [event momentumPhase] == NSEventPhaseEnded ||
       ([event momentumPhase] == NSEventPhaseNone &&
           [event phase] == NSEventPhaseEnded);
 
   [delegate_ userScrolling:!scrollComplete];
 }
 
 @end