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

chrome/browser/cocoa/browser_window_controller.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/browser_window_controller.h"
 
 #include <Carbon/Carbon.h>
 
 #include "app/l10n_util_mac.h"
 #include "base/mac_util.h"
@@ skipping 1254 matching lines @@
   CGFloat maxWidth = NSWidth([contentView frame]);
   [findBarCocoaController_ positionFindBarViewAtMaxY:maxY maxWidth:maxWidth];
 }
 
 - (NSWindow*)createFullscreenWindow {
   return [[[FullscreenWindow alloc] initForScreen:[[self window] screen]]
            autorelease];
 }
 
 - (NSInteger)numberOfTabs {
+  // count() includes pinned tabs (both live and phantom).
   return browser_->tabstrip_model()->count();
 }
 
+- (BOOL)hasLiveTabs {
+  return browser_->tabstrip_model()->HasNonPhantomTabs();
+}
+
 - (NSString*)selectedTabTitle {
   TabContents* contents = browser_->tabstrip_model()->GetSelectedTabContents();
   return base::SysUTF16ToNSString(contents->GetTitle());
 }
 
 - (NSRect)regularWindowFrame {
   return [self isFullscreen] ? [savedRegularWindow_ frame] :
                                [[self window] frame];
 }
 
@@ skipping 557 matching lines @@
 
 - (BOOL)supportsBookmarkBar {
   return [self supportsWindowFeature:Browser::FEATURE_BOOKMARKBAR];
 }
 
 - (BOOL)isNormalWindow {
   return browser_->type() == Browser::TYPE_NORMAL;
 }
 
 @end  // @implementation BrowserWindowController(WindowType)