[Mac] Remove -[NSWindow drawRect] swizzling.

chrome/browser/ui/cocoa/framed_browser_window.mm

Index: chrome/browser/ui/cocoa/framed_browser_window.mm
diff --git a/chrome/browser/ui/cocoa/framed_browser_window.mm b/chrome/browser/ui/cocoa/framed_browser_window.mm
index 7ad19907f6caaf566d6c09891e73d8ed912c7b32..5d098be8d3c00a47cd7a24ab4c2703c7ba498748 100644
--- a/chrome/browser/ui/cocoa/framed_browser_window.mm
+++ b/chrome/browser/ui/cocoa/framed_browser_window.mm
@@ -12,7 +12,6 @@
 #include "chrome/browser/themes/theme_service.h"
 #import "chrome/browser/ui/cocoa/browser_window_controller.h"
 #import "chrome/browser/ui/cocoa/browser_window_utils.h"
-#import "chrome/browser/ui/cocoa/custom_frame_view.h"
 #import "chrome/browser/ui/cocoa/tabs/tab_strip_controller.h"
 #import "chrome/browser/ui/cocoa/themed_window.h"
 #include "grit/theme_resources.h"
@@ -44,18 +43,6 @@ const CGFloat kWindowGradientHeight = 24.0;
 
 @end
 
-// Undocumented APIs. They are really on NSGrayFrame rather than NSView. Take
-// care to only call them on the NSView passed into
-// -[NSWindow drawCustomRect:forView:].
-@interface NSView (UndocumentedAPI)
-
-- (float)roundedCornerRadius;
-- (CGRect)_titlebarTitleRect;
-- (void)_drawTitleStringIn:(struct CGRect)arg1 withColor:(id)color;
-
-@end
-
-
 @implementation FramedBrowserWindow
 
 - (id)initWithContentRect:(NSRect)contentRect