Revert of BackgroundGradientView: -drawBackground: → -drawRect:

chrome/browser/ui/cocoa/background_gradient_view.h

Index: chrome/browser/ui/cocoa/background_gradient_view.h
diff --git a/chrome/browser/ui/cocoa/background_gradient_view.h b/chrome/browser/ui/cocoa/background_gradient_view.h
index 433fe1f590f7e9ce55516c2e984c8f8b2f084512..60f5a910896f7506409908df43bc90847c7bea42 100644
--- a/chrome/browser/ui/cocoa/background_gradient_view.h
+++ b/chrome/browser/ui/cocoa/background_gradient_view.h
@@ -22,12 +22,15 @@
 // 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_