Implemented fullscreen exit animation with AppKit

chrome/browser/ui/cocoa/full_size_content_window.mm

Index: chrome/browser/ui/cocoa/full_size_content_window.mm
diff --git a/chrome/browser/ui/cocoa/full_size_content_window.mm b/chrome/browser/ui/cocoa/full_size_content_window.mm
index 1dea52a7000bd65d1d62417433394e089eb08e28..6a160966ccc2d0fe5cc8054518253f1a4a5553e2 100644
--- a/chrome/browser/ui/cocoa/full_size_content_window.mm
+++ b/chrome/browser/ui/cocoa/full_size_content_window.mm
@@ -12,22 +12,18 @@
 
 @end
 
-// This view always takes the size of its superview. It is intended to be used
-// as a NSWindow's contentView.  It is needed because NSWindow's implementation
-// explicitly resizes the contentView at inopportune times.
-@interface FullSizeContentView : NSView
-@end
-
 @implementation FullSizeContentView
 
-// This method is directly called by AppKit during a live window resize.
-// Override it to prevent the content view from shrinking.
 - (void)setFrameSize:(NSSize)size {
   if ([self superview])
     size = [[self superview] bounds].size;
   [super setFrameSize:size];
 }
 
+- (void)forceFrameSize:(NSSize)size {
+  [super setFrameSize:size];
+}
+
 @end
 
 @implementation FullSizeContentWindow