Purge the App Launcher code from Mac

ui/app_list/cocoa/scroll_view_with_no_scrollbars.mm

Index: ui/app_list/cocoa/scroll_view_with_no_scrollbars.mm
diff --git a/ui/app_list/cocoa/scroll_view_with_no_scrollbars.mm b/ui/app_list/cocoa/scroll_view_with_no_scrollbars.mm
deleted file mode 100644
index d4cff30a462a47bfd98b5e282f382cb42a2d5f97..0000000000000000000000000000000000000000
--- a/ui/app_list/cocoa/scroll_view_with_no_scrollbars.mm
+++ /dev/null
@@ -1,71 +0,0 @@
-// 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/scoped_cftyperef.h"
-#include "base/mac/scoped_nsobject.h"
-#include "base/mac/sdk_forward_declarations.h"
-
-@interface InvisibleScroller : NSScroller;
-@end
-
-@implementation InvisibleScroller
-
-// Makes it non-interactive (and invisible) on Lion with both 10.6 and 10.7
-// SDKs. TODO(tapted): Find a way to make it non-interactive on Snow Leopard.
-// TODO(tapted): Find a way to make it take up no space on Lion with a 10.6 SDK.
-- (NSRect)rectForPart:(NSScrollerPart)aPart {
-  return NSZeroRect;
-}
-
-@end
-
-@implementation ScrollViewWithNoScrollbars
-
-@synthesize delegate = delegate_;
-
-- (id)initWithFrame:(NSRect)frame {
-  if ((self = [super initWithFrame:frame])) {
-    [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)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;
-    else
-      return;
-
-    base::ScopedCFTypeRef<CGEventRef> cgEvent(CGEventCreateScrollWheelEvent(
-        NULL, kCGScrollEventUnitLine, 2, 0, downOrRight ? 1 : -1));
-    [super scrollWheel:[NSEvent eventWithCGEvent:cgEvent]];
-    return;
-  }
-
-  [super scrollWheel:event];
-  if (![event respondsToSelector:@selector(momentumPhase)])
-    return;
-
-  BOOL scrollComplete = [event momentumPhase] == NSEventPhaseEnded ||
-      ([event momentumPhase] == NSEventPhaseNone &&
-          [event phase] == NSEventPhaseEnded);
-
-  [delegate_ userScrolling:!scrollComplete];
-}
-
-@end