Mac: Prevent NTP mousewheel events from being suppressed on Lion.

chrome/browser/platform_util_mac.mm

Index: chrome/browser/platform_util_mac.mm
diff --git a/chrome/browser/platform_util_mac.mm b/chrome/browser/platform_util_mac.mm
index 0debf7b8ea6230cf8e279e9c348c3673f832c115..fa582d598f4ed4bb1f517d57a724c1caccf225f4 100644
--- a/chrome/browser/platform_util_mac.mm
+++ b/chrome/browser/platform_util_mac.mm
@@ -154,4 +154,10 @@ bool IsVisible(gfx::NativeView view) {
           [[view window] isVisible]);
 }
 
+bool IsSwipeTrackingFromScrollEventsEnabled() {
+  SEL selector = @selector(isSwipeTrackingFromScrollEventsEnabled);
+  return [NSEvent respondsToSelector:selector]
+      && [NSEvent performSelector:selector];
+}
+
 }  // namespace platform_util