Fix page navigation being incorrectly fired on Mac OSX.

chrome/browser/renderer_host/chrome_render_widget_host_view_mac_delegate.mm

Index: chrome/browser/renderer_host/chrome_render_widget_host_view_mac_delegate.mm
diff --git a/chrome/browser/renderer_host/chrome_render_widget_host_view_mac_delegate.mm b/chrome/browser/renderer_host/chrome_render_widget_host_view_mac_delegate.mm
index 464d901bfc372a7e80fc0139a7b702154225fed6..37abdf2d8ce0c13a0c84fd74b6401c41ff3d37f4 100644
--- a/chrome/browser/renderer_host/chrome_render_widget_host_view_mac_delegate.mm
+++ b/chrome/browser/renderer_host/chrome_render_widget_host_view_mac_delegate.mm
@@ -193,6 +193,11 @@ class SpellCheckObserver : public content::WebContentsObserver {
   [historySwiper_ rendererHandledWheelEvent:event consumed:consumed];
 }
 
+- (void)rendererHandledGestureScrollEvent:(const blink::WebGestureEvent&)event
+                                 consumed:(BOOL)consumed {
+  [historySwiper_ rendererHandledGestureScrollEvent:event consumed:consumed];
+}
+
 // Spellchecking methods
 // The next five methods are implemented here since this class is the first
 // responder for anything in the browser.