[Mac] Remove unused property on GradientButtonCell

chrome/browser/ui/cocoa/gradient_button_cell.h

 // Copyright (c) 2011 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.
 
 #ifndef CHROME_BROWSER_UI_COCOA_GRADIENT_BUTTON_CELL_H_
 #define CHROME_BROWSER_UI_COCOA_GRADIENT_BUTTON_CELL_H_
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/mac/scoped_nsobject.h"
@@ skipping 46 matching lines @@
   // Custom drawing means we need to perform our own mouse tracking if
   // the cell is setShowsBorderOnlyWhileMouseInside:YES.
   BOOL isMouseInside_;
   base::scoped_nsobject<NSTrackingArea> trackingArea_;
   BOOL shouldTheme_;
   CGFloat hoverAlpha_;  // 0-1. Controls the alpha during mouse hover
   NSTimeInterval lastHoverUpdate_;
   base::scoped_nsobject<NSGradient> gradient_;
   gradient_button_cell::PulseState pulseState_;
   CGFloat outerStrokeAlphaMult_;  // For pulsing.
-  base::scoped_nsobject<NSImage> overlayImage_;
 }
 
 // Turn off theming.  Temporary work-around.
 - (void)setShouldTheme:(BOOL)shouldTheme;
 
 - (void)drawBorderAndFillForTheme:(const ui::ThemeProvider*)themeProvider
                       controlView:(NSView*)controlView
                         innerPath:(NSBezierPath*)innerPath
               showClickedGradient:(BOOL)showClickedGradient
             showHighlightGradient:(BOOL)showHighlightGradient
@@ skipping 38 matching lines @@
 
 // The amount by which the gradient button cell should nudge the path used to
 // draw the hover (and pressed) state background path.
 - (CGFloat)hoverBackgroundVerticalOffsetInControlView:(NSView*)controlView;
 
 // Returns YES if the cell's tag indicates a Material Design button type.
 - (BOOL)isMaterialDesignButtonType;
 
 @property(assign, nonatomic) CGFloat hoverAlpha;
 
-// An image that will be drawn after the normal content of the button cell,
-// overlaying it.  Never themed.
-@property(retain, nonatomic) NSImage* overlayImage;
-
 @end
 
 @interface GradientButtonCell(TestingAPI)
 - (BOOL)isMouseInside;
 - (BOOL)pulsing;
 - (gradient_button_cell::PulseState)pulseState;
 - (void)setPulseState:(gradient_button_cell::PulseState)pstate;
 @end
 
 #endif  // CHROME_BROWSER_UI_COCOA_GRADIENT_BUTTON_CELL_H_