Add a NavigationThrottle to the public content/ interface

content/public/test/test_renderer_host.h

Index: content/public/test/test_renderer_host.h
diff --git a/content/public/test/test_renderer_host.h b/content/public/test/test_renderer_host.h
index 4206c16e693d0471488948e5cdfe2a1cab63060c..54d810451595d33343a6767d089a3306aa2c99cb 100644
--- a/content/public/test/test_renderer_host.h
+++ b/content/public/test/test_renderer_host.h
@@ -36,6 +36,7 @@ class MockRenderProcessHostFactory;
 class NavigationController;
 class RenderProcessHostFactory;
 class RenderViewHostDelegate;
+class TestNavigationHandleFactory;
 class TestRenderFrameHostFactory;
 class TestRenderViewHostFactory;
 class WebContents;
@@ -182,6 +183,7 @@ class RenderViewHostTestEnabler {
   scoped_ptr<MockRenderProcessHostFactory> rph_factory_;
   scoped_ptr<TestRenderViewHostFactory> rvh_factory_;
   scoped_ptr<TestRenderFrameHostFactory> rfh_factory_;
+  scoped_ptr<TestNavigationHandleFactory> navigation_handle_factory_;
 };
 
 // RenderViewHostTestHarness ---------------------------------------------------