Fix dragging a tab out of a window when the only tabs left behind are phantom...

chrome/browser/cocoa/tab_view.mm

 // Copyright (c) 2010 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.
 
 #import "chrome/browser/cocoa/tab_view.h"
 
 #include "base/logging.h"
 #include "base/nsimage_cache_mac.h"
 #include "chrome/browser/browser_theme_provider.h"
 #import "chrome/browser/cocoa/tab_controller.h"
@@ skipping 394 matching lines @@
     [sourceController_ removePlaceholder];
 
     // Detach from the current window and put it in a new window. If there are
     // no more tabs remaining after detaching, the source window is about to
     // go away (it's been autoreleased) so we need to ensure we don't reference
     // it any more. In that case the new controller becomes our source
     // controller.
     draggedController_ = [sourceController_ detachTabToNewWindow:self];
     dragWindow_ = [draggedController_ window];
     [dragWindow_ setAlphaValue:0.0];
-    if (![sourceController_ numberOfTabs]) {
+    if (![sourceController_ hasLiveTabs]) {
       sourceController_ = draggedController_;
       sourceWindow_ = dragWindow_;
     }
 
     // If dragging the tab only moves the current window, do not show overlay
     // so that sheets stay on top of the window.
     // Bring the target window to the front and make sure it has a border.
     [dragWindow_ setLevel:NSFloatingWindowLevel];
     [dragWindow_ setHasShadow:YES];
     [dragWindow_ orderFront:nil];
@@ skipping 533 matching lines @@
   }
 
   if (nextUpdate < kNoUpdate)
     [self performSelector:_cmd withObject:nil afterDelay:nextUpdate];
 
   [self resetLastGlowUpdateTime];
   [self setNeedsDisplay:YES];
 }
 
 @end  // @implementation TabView(Private)