Move icon fallbacks into ExtensionAction.

chrome/browser/ui/cocoa/extensions/browser_action_button.h

Index: chrome/browser/ui/cocoa/extensions/browser_action_button.h
diff --git a/chrome/browser/ui/cocoa/extensions/browser_action_button.h b/chrome/browser/ui/cocoa/extensions/browser_action_button.h
index 6a4d413c69970090bc504765f099256041618ffc..513556eb47cf89f00584fde28af86d91b3deaedd 100644
--- a/chrome/browser/ui/cocoa/extensions/browser_action_button.h
+++ b/chrome/browser/ui/cocoa/extensions/browser_action_button.h
@@ -30,12 +30,6 @@ extern NSString* const kBrowserActionButtonDragEndNotification;
   // extension's icon.
   scoped_ptr<ExtensionImageTrackerBridge> imageLoadingBridge_;
 
-  // The default icon of the Button.
-  scoped_nsobject<NSImage> defaultIcon_;
-
-  // The icon specific to the active tab.
-  scoped_nsobject<NSImage> tabSpecificIcon_;
-
   // Used to move the button and query whether a button is currently animating.
   scoped_nsobject<NSViewAnimation> moveAnimation_;
 
@@ -61,10 +55,6 @@ extern NSString* const kBrowserActionButtonDragEndNotification;
 
 - (void)setFrame:(NSRect)frameRect animate:(BOOL)animate;
 
-- (void)setDefaultIcon:(NSImage*)image;
-
-- (void)setTabSpecificIcon:(NSImage*)image;
-
 - (void)updateState;
 
 - (BOOL)isAnimating;