Set user_gesture bit at NavigationHandle creation time.

content/public/browser/navigation_handle.h

Index: content/public/browser/navigation_handle.h
diff --git a/content/public/browser/navigation_handle.h b/content/public/browser/navigation_handle.h
index def875711344a1c365349ebb078f5cb8ee6aa95b..b1a4a1df8392a0c687545456e74734a685a8beee 100644
--- a/content/public/browser/navigation_handle.h
+++ b/content/public/browser/navigation_handle.h
@@ -210,7 +210,8 @@ class CONTENT_EXPORT NavigationHandle {
       const GURL& url,
       RenderFrameHost* render_frame_host,
       bool committed = false,
-      net::Error error = net::OK);
+      net::Error error = net::OK,
+      bool has_user_gesture = false);
 
   // Registers a NavigationThrottle for tests. The throttle can
   // modify the request, pause the request or cancel the request. This will
@@ -226,7 +227,6 @@ class CONTENT_EXPORT NavigationHandle {
   virtual NavigationThrottle::ThrottleCheckResult
   CallWillStartRequestForTesting(bool is_post,
                                  const Referrer& sanitized_referrer,
-                                 bool has_user_gesture,
                                  ui::PageTransition transition,
                                  bool is_external_protocol) = 0;