Fix page navigation being incorrectly fired on Mac OSX.

chrome/browser/renderer_host/chrome_render_widget_host_view_mac_delegate.mm

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import "chrome/browser/renderer_host/chrome_render_widget_host_view_mac_delegate.h"
 
 #include <cmath>
 
 #include "base/strings/sys_string_conversions.h"
 #include "chrome/browser/devtools/devtools_window.h"
@@ skipping 175 matching lines @@
   }
 
   return NO;
 }
 
 - (void)rendererHandledWheelEvent:(const blink::WebMouseWheelEvent&)event
                          consumed:(BOOL)consumed {
   [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.
 
 // This message is sent whenever the user specifies that a word should be
 // changed from the spellChecker.
 - (void)changeSpelling:(id)sender {
   // Grab the currently selected word from the spell panel, as this is the word
   // that we want to replace the selected word in the text with.
   NSString* newWord = [[sender selectedCell] stringValue];
@@ skipping 44 matching lines @@
 }
 
 - (void)spellCheckEnabled:(BOOL)enabled checked:(BOOL)checked {
   spellcheckEnabled_ = enabled;
   spellcheckChecked_ = checked;
 }
 
 // END Spellchecking methods
 
 @end