(Mac) Make mashing the close tab button work.

chrome/browser/cocoa/tab_controller.mm

 // Copyright (c) 2009 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.
 
 #include "base/mac_util.h"
 #include "chrome/browser/cocoa/nsimage_cache.h"
 #import "chrome/browser/cocoa/tab_controller.h"
 #import "chrome/browser/cocoa/tab_controller_target.h"
 #import "chrome/browser/cocoa/tab_view.h"
 #import "third_party/GTM/AppKit/GTMTheme.h"
@@ skipping 164 matching lines @@
   }
   // Default to the selected text color unless told otherwise.
   if (!color) {
     color = [theme textColorForStyle:GTMThemeStyleToolBar
                                state:GTMThemeStateActiveWindow];
   }
 
   [titleView_ setTextColor:color ? color : [NSColor textColor]];
   [[self view] setNeedsDisplay:YES];
 }
+
+// Called by the tabs to determine whether we are in rapid (tab) closure mode.
+- (BOOL)inRapidClosureMode {
+  if ([[self target] respondsToSelector:@selector(inRapidClosureMode)]) {
+    return [[self target] performSelector:@selector(inRapidClosureMode)] ?
+        YES : NO;
+  }
+  return NO;
+}
+
 @end