Mac: Fix theme image drawing when building with >=10.9 SDK.

chrome/browser/ui/cocoa/tabs/tab_window_controller.h

Index: chrome/browser/ui/cocoa/tabs/tab_window_controller.h
diff --git a/chrome/browser/ui/cocoa/tabs/tab_window_controller.h b/chrome/browser/ui/cocoa/tabs/tab_window_controller.h
index bed72379c55e3c1943a6d9163d5d4d69c6983486..7238b090d55db0b4715989bbd9288d1fcfe31f7d 100644
--- a/chrome/browser/ui/cocoa/tabs/tab_window_controller.h
+++ b/chrome/browser/ui/cocoa/tabs/tab_window_controller.h
@@ -24,6 +24,7 @@
 @interface TabWindowController : NSWindowController<NSWindowDelegate> {
  @private
   base::scoped_nsobject<FastResizeView> tabContentArea_;
+  base::scoped_nsobject<NSView> tabStripBackgroundView_;
   base::scoped_nsobject<TabStripView> tabStripView_;
 
   // The child window used during dragging to achieve the opacity tricks.
@@ -36,6 +37,7 @@
   base::scoped_nsobject<FocusTracker> focusBeforeOverlay_;
   BOOL closeDeferred_;  // If YES, call performClose: in removeOverlay:.
 }
+@property(readonly, nonatomic) NSView* tabStripBackgroundView;
 @property(readonly, nonatomic) TabStripView* tabStripView;
 @property(readonly, nonatomic) FastResizeView* tabContentArea;