Fix page navigation being incorrectly fired on Mac OSX.

content/public/browser/render_widget_host_view_mac_delegate.h

Index: content/public/browser/render_widget_host_view_mac_delegate.h
diff --git a/content/public/browser/render_widget_host_view_mac_delegate.h b/content/public/browser/render_widget_host_view_mac_delegate.h
index c00d8bd3109183e07a0f57f5f5e916720e60e5c9..427f466f117de3eea869940b016aaa454318bc9b 100644
--- a/content/public/browser/render_widget_host_view_mac_delegate.h
+++ b/content/public/browser/render_widget_host_view_mac_delegate.h
@@ -8,6 +8,7 @@
 #import <Cocoa/Cocoa.h>
 
 namespace blink {
+class WebGestureEvent;
 class WebMouseWheelEvent;
 }
 
@@ -60,6 +61,8 @@ class WebMouseWheelEvent;
 // |event|.
 - (void)rendererHandledWheelEvent:(const blink::WebMouseWheelEvent&)event
                          consumed:(BOOL)consumed;
+- (void)rendererHandledGestureScrollEvent:(const blink::WebGestureEvent&)event
+                                 consumed:(BOOL)consumed;
 @end
 
 #endif  // CONTENT_PUBLIC_BROWSER_RENDER_WIDGET_HOST_VIEW_MAC_DELEGATE_H_