Add a NavigationThrottle to the public content/ interface

content/browser/frame_host/navigator_impl.cc

Index: content/browser/frame_host/navigator_impl.cc
diff --git a/content/browser/frame_host/navigator_impl.cc b/content/browser/frame_host/navigator_impl.cc
index b2be362dfb61d9b6904098078d4c62f5f2c1cbc6..ab998deac81aa875502684ec32b0db9e95baa944 100644
--- a/content/browser/frame_host/navigator_impl.cc
+++ b/content/browser/frame_host/navigator_impl.cc
@@ -11,6 +11,7 @@
 #include "content/browser/frame_host/frame_tree_node.h"
 #include "content/browser/frame_host/navigation_controller_impl.h"
 #include "content/browser/frame_host/navigation_entry_impl.h"
+#include "content/browser/frame_host/navigation_handle_factory.h"
 #include "content/browser/frame_host/navigation_handle_impl.h"
 #include "content/browser/frame_host/navigation_request.h"
 #include "content/browser/frame_host/navigation_request_info.h"
@@ -158,8 +159,10 @@ void NavigatorImpl::DidStartProvisionalLoad(
     render_frame_host->SetNavigationHandle(scoped_ptr<NavigationHandleImpl>());
   }
 
-  render_frame_host->SetNavigationHandle(
-      NavigationHandleImpl::Create(url, is_main_frame, delegate_));
+  GURL filtered_url = url;
+  render_frame_host->GetProcess()->FilterURL(false, &filtered_url);

[Charlie Reis, 2015/09/16 00:09:25]

Again, I'm not sure this is the right place to be calling FilterURL.  Maybe we
can chat about this while you're in town.

[clamy, 2015/09/16 01:03:22]

This was removed since we already call FilterURL a few lines above.

+  render_frame_host->SetNavigationHandle(NavigationHandleFactory::Create(
+      url, filtered_url, is_main_frame, delegate_));
 }
 
 void NavigatorImpl::DidFailProvisionalLoadWithError(