Add a NavigationThrottle to the public content/ interface

content/public/test/test_renderer_host.cc

Index: content/public/test/test_renderer_host.cc
diff --git a/content/public/test/test_renderer_host.cc b/content/public/test/test_renderer_host.cc
index d8847791a77f9dd1449664c8978b8450184646e1..0ec91c0aa0c893f387022c00fea7458f9de7981a 100644
--- a/content/public/test/test_renderer_host.cc
+++ b/content/public/test/test_renderer_host.cc
@@ -17,6 +17,7 @@
 #include "content/public/test/test_browser_context.h"
 #include "content/test/browser_side_navigation_test_utils.h"
 #include "content/test/content_browser_sanity_checker.h"
+#include "content/test/test_navigation_handle_factory.h"
 #include "content/test/test_render_frame_host.h"
 #include "content/test/test_render_frame_host_factory.h"
 #include "content/test/test_render_view_host.h"
@@ -80,7 +81,8 @@ bool RenderViewHostTester::HasTouchEventHandler(RenderViewHost* rvh) {
 RenderViewHostTestEnabler::RenderViewHostTestEnabler()
     : rph_factory_(new MockRenderProcessHostFactory()),
       rvh_factory_(new TestRenderViewHostFactory(rph_factory_.get())),
-      rfh_factory_(new TestRenderFrameHostFactory()) {}
+      rfh_factory_(new TestRenderFrameHostFactory()),
+      navigation_handle_factory_(new TestNavigationHandleFactory()) {}
 
 RenderViewHostTestEnabler::~RenderViewHostTestEnabler() {
 }