mac: Always do history swiping on the NTP on lion devices with touchpad.

chrome/browser/ui/browser.h

 // Copyright (c) 2012 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.
 
 #ifndef CHROME_BROWSER_UI_BROWSER_H_
 #define CHROME_BROWSER_UI_BROWSER_H_
 #pragma once
 
 #include <map>
 #include <set>
@@ skipping 496 matching lines @@
   // Assorted browser commands ////////////////////////////////////////////////
 
   // NOTE: Within each of the following sections, the IDs are ordered roughly by
   // how they appear in the GUI/menus (left to right, top to bottom, etc.).
 
   // Navigation commands
   bool CanGoBack() const;
   void GoBack(WindowOpenDisposition disposition);
   bool CanGoForward() const;
   void GoForward(WindowOpenDisposition disposition);
+  bool IsOnNtp() const;

[Robert Sesek, 2012/01/30 17:13:18]

Any reason this needs to be defined for all Browsers? This seems like it could
be just checked in crwhv_mac_delegate.mm.

[Nico, 2012/01/30 17:59:22]

I didn't realize GetSelectedWebContents() was public. Done!

   void Reload(WindowOpenDisposition disposition);
   void ReloadIgnoringCache(WindowOpenDisposition disposition);  // Shift-reload.
   void Home(WindowOpenDisposition disposition);
   void OpenCurrentURL();
   void Stop();
   // Window management commands
   void NewWindow();
   void NewIncognitoWindow();
   void CloseWindow();
   void NewTab();
@@ skipping 912 matching lines @@
 
   scoped_refptr<FullscreenController> fullscreen_controller_;
 
   // True if the browser window has been shown at least once.
   bool window_has_shown_;
 
   DISALLOW_COPY_AND_ASSIGN(Browser);
 };
 
 #endif  // CHROME_BROWSER_UI_BROWSER_H_