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..9ab14bc677a680b6c9e842b96aa1b7fdecae30c4 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) {
@@ -1523,6 +1521,11 @@ void Browser::GoForward(WindowOpenDisposition disposition) {
     GetOrCloneTabForDisposition(disposition)->GetController().GoForward();
 }
 
+bool Browser::IsOnNtp() const {
+  WebContents* contents = GetSelectedWebContents();
+  return contents && contents->GetURL() == GURL(chrome::kChromeUINewTabURL);
+}
+
 void Browser::Reload(WindowOpenDisposition disposition) {
   content::RecordAction(UserMetricsAction("Reload"));
   ReloadInternal(disposition, false);