Do not reset NavigationHandle when navigating same-page

content/browser/loader/navigation_resource_throttle.cc

Index: content/browser/loader/navigation_resource_throttle.cc
diff --git a/content/browser/loader/navigation_resource_throttle.cc b/content/browser/loader/navigation_resource_throttle.cc
index 41ace38b7b1c1f7f18236becf22035955da49486..e8f9e6ed25b47782c18c8d174c31ec3cc3f92e7e 100644
--- a/content/browser/loader/navigation_resource_throttle.cc
+++ b/content/browser/loader/navigation_resource_throttle.cc
@@ -81,11 +81,9 @@ NavigationHandleImpl* FindNavigationHandle(
   }
 
   NavigationHandleImpl* navigation_handle =
-      render_frame_host->frame_tree_node()
-          ->navigator()
-          ->GetNavigationHandleForFrameHost(render_frame_host);
+      render_frame_host->navigation_handle();
   if (!navigation_handle) {
-    SendCheckResultToIOThread(callback, NavigationThrottle::PROCEED);
+    SendCheckResultToIOThread(callback, NavigationThrottle::CANCEL);

[clamy, 2016/11/09 18:05:52]

Note that this undoes https://codereview.chromium.org/2481173002/ now that we
shouldn't delete the NavigationHandle improperly.

     return nullptr;
   }
   return navigation_handle;