mac: Remove IsOSSnowLeopard().

chrome/browser/ui/cocoa/browser_window_controller.mm

 // Copyright 2012 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 "chrome/browser/ui/cocoa/browser_window_controller.h"
 
 #include <cmath>
 #include <numeric>
 #include <utility>
 
@@ skipping 242 matching lines @@
     // Set different minimum sizes on tabbed windows vs non-tabbed, e.g. popups.
     // This has to happen before -enforceMinWindowSize: is called further down.
     NSSize minSize = [self isTabbedWindow] ?
       NSMakeSize(400, 272) : NSMakeSize(100, 122);
     [[self window] setMinSize:minSize];
 
     // Create the bar visibility lock set; 10 is arbitrary, but should hopefully
     // be big enough to hold all locks that'll ever be needed.
     barVisibilityLocks_.reset([[NSMutableSet setWithCapacity:10] retain]);
 
-    // Set the window to not have rounded corners, which prevents the resize
-    // control from being inset slightly and looking ugly. Only bother to do
-    // this on Snow Leopard; on Lion and later all windows have rounded bottom
-    // corners, and this won't work anyway.
-    if (base::mac::IsOSSnowLeopard() &&
-        [window respondsToSelector:@selector(setBottomCornerRounded:)])
-      [window setBottomCornerRounded:NO];
-
     // Lion will attempt to automagically save and restore the UI. This
     // functionality appears to be leaky (or at least interacts badly with our
     // architecture) and thus BrowserWindowController never gets released. This
     // prevents the browser from being able to quit <http://crbug.com/79113>.
     if ([window respondsToSelector:@selector(setRestorable:)])
       [window setRestorable:NO];
 
     // Get the windows to swish in on Lion.
     if ([window respondsToSelector:@selector(setAnimationBehavior:)])
       [window setAnimationBehavior:NSWindowAnimationBehaviorDocumentWindow];
@@ skipping 1827 matching lines @@
 
 - (BOOL)isTabbedWindow {
   return browser_->is_type_tabbed();
 }
 
 - (NSRect)savedRegularWindowFrame {
   return savedRegularWindowFrame_;
 }
 
 @end  // @implementation BrowserWindowController(WindowType)