Revert of BackgroundGradientView: -drawBackground: → -drawRect:

chrome/browser/ui/cocoa/background_gradient_view.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_BACKGROUND_GRADIENT_VIEW_H_
 #define CHROME_BROWSER_UI_COCOA_BACKGROUND_GRADIENT_VIEW_H_
 
 #import <Cocoa/Cocoa.h>
 
 #import "chrome/browser/ui/cocoa/themed_window.h"
 
 // A custom view that draws a 'standard' background gradient.
 // Base class for other Chromium views.
 @interface BackgroundGradientView : NSView<ThemedWindowDrawing> {
  @private
   BOOL showsDivider_;
 }
 
 // Controls whether the bar draws a dividing line at the bottom.
 @property(nonatomic, assign) BOOL showsDivider;
 
 // The color used for the bottom stroke. Public so subclasses can use.
 - (NSColor*)strokeColor;
 
-// The pattern phase that will be used by -drawRect:.
+// The pattern phase that will be used by -drawBackground:.
 // Defaults to align the top of the theme image with the top of the tabs.
 // Views that draw at the bottom of the window (download bar) can override to
 // change the pattern phase.
 - (NSPoint)patternPhase;
 
+// Draws the background image into the current NSGraphicsContext.
+- (void)drawBackground:(NSRect)dirtyRect;
+
 @end
 
 #endif  // CHROME_BROWSER_UI_COCOA_BACKGROUND_GRADIENT_VIEW_H_