Update Panel mininimize/restore button on strip and expansion state change.

chrome/browser/ui/panels/panel_window_controller_cocoa.mm

 // Copyright (c) 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.
 
 #include "chrome/browser/ui/panels/panel_window_controller_cocoa.h"
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/logging.h"
 #include "base/mac/bundle_locations.h"
@@ skipping 756 matching lines @@
 - (void)drag:(NSPoint)mouseLocation {
   // Convert from Cocoa's screen coordinates to platform-indepedent screen
   // coordinates because PanelManager method takes platform-indepedent screen
   // coordinates.
   windowShim_->panel()->manager()->Drag(
       cocoa_utils::ConvertPointFromCocoaCoordinates(mouseLocation));
 }
 
 - (void)setPanelFrame:(NSRect)frame
               animate:(BOOL)animate {
-  [self updateTitleBarMinimizeRestoreButtonVisibility];
-
   BOOL jumpToDestination = (!animateOnBoundsChange_ || !animate);
 
   // If no animation is in progress, apply bounds change instantly.
   if (jumpToDestination && ![self isAnimatingBounds]) {
     [[self window] setFrame:frame display:YES animate:NO];
     return;
   }
 
   NSDictionary *windowResize = [NSDictionary dictionaryWithObjectsAndKeys:
       [self window], NSViewAnimationTargetKey,
@@ skipping 220 matching lines @@
   [[self window] setLevel:NSDockWindowLevel];
 }
 
 - (void)enableResizeByMouse:(BOOL)enable {
   if (![self isWindowLoaded])
     return;
   [[self window] invalidateCursorRectsForView:overlayView_];
 }
 
 @end