mac: Remove IsOSSnowLeopard().

ui/views/cocoa/bridged_native_widget.mm

 // Copyright 2014 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.
 
 #import "ui/views/cocoa/bridged_native_widget.h"
 
 #import <objc/runtime.h>
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 688 matching lines @@
   // toggleFullScreen:]. Unfortunately, this change happens after AppKit calls
   // -[NSWindowDelegate windowWillEnterFullScreen:], and AppKit doesn't send an
   // orderWindow message. So intercepting the implicit change is hard.
   // Luckily, to trigger externally, the window typically needs to be visible in
   // the first place. So we can just ensure the window is visible here instead
   // of relying on AppKit to do it, and not worry that OnVisibilityChanged()
   // won't be called for externally triggered fullscreen requests.
   if (!window_visible_)
     SetVisibilityState(SHOW_INACTIVE);
 
-  if (base::mac::IsOSSnowLeopard()) {
-    NOTIMPLEMENTED();
-    return;  // TODO(tapted): Implement this for Snow Leopard.
-  }
-
   // Enable fullscreen collection behavior because:
   // 1: -[NSWindow toggleFullscreen:] would otherwise be ignored,
   // 2: the fullscreen button must be enabled so the user can leave fullscreen.
   // This will be reset when a transition out of fullscreen completes.
   gfx::SetNSWindowCanFullscreen(window_, true);
 
   [window_ toggleFullScreen:nil];
 }
 
 void BridgedNativeWidget::OnSizeChanged() {
@@ skipping 584 matching lines @@
   [bridged_view_ setMouseDownCanMoveWindow:draggable];
   // AppKit will not update its cache of mouseDownCanMoveWindow unless something
   // changes. Previously we tried adding an NSView and removing it, but for some
   // reason it required reposting the mouse-down event, and didn't always work.
   // Calling the below seems to be an effective solution.
   [window_ setMovableByWindowBackground:NO];
   [window_ setMovableByWindowBackground:YES];
 }
 
 }  // namespace views