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

chrome/browser/ui/browser.cc

Index: chrome/browser/ui/browser.cc
diff --git a/chrome/browser/ui/browser.cc b/chrome/browser/ui/browser.cc
index c54aad042315e4f94c8d9a17b34ff04c0a790cbf..d92f4feb2dbaaa4dcfd311e653c9e9d6833dd813 100644
--- a/chrome/browser/ui/browser.cc
+++ b/chrome/browser/ui/browser.cc
@@ -1493,8 +1493,7 @@ bool Browser::IsClosingPermitted() {
 }
 
 bool Browser::CanGoBack() const {
-  return GetSelectedTabContentsWrapper()->
-      web_contents()->GetController().CanGoBack();
+  return GetSelectedWebContents()->GetController().CanGoBack();
 }
 
 void Browser::GoBack(WindowOpenDisposition disposition) {
@@ -1513,8 +1512,7 @@ void Browser::GoBack(WindowOpenDisposition disposition) {
 }
 
 bool Browser::CanGoForward() const {
-  return GetSelectedTabContentsWrapper()->
-      web_contents()->GetController().CanGoForward();
+  return GetSelectedWebContents()->GetController().CanGoForward();
 }
 
 void Browser::GoForward(WindowOpenDisposition disposition) {