Fix some unit_tests under PlzNavigate

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 3a645cf51c92f2da3aae875fd2ba889c050eb873..58132cea67dc49cc83d0fcb8ccc2e2aa7562bb33 100644
--- a/content/public/test/test_renderer_host.h
+++ b/content/public/test/test_renderer_host.h
@@ -96,6 +96,15 @@ class RenderFrameHostTester {
   // Simulates a navigation stopping in the RenderFrameHost.
   virtual void SimulateNavigationStop() = 0;
 
+  // If we are doing a cross-site navigation, this simulates the current
+  // RenderFrameHost notifying that it has unloaded so the pending

[clamy, 2016/08/31 18:23:21]

nit: s/it has unloaded/BeforeUnload has executed

[scottmg, 2016/08/31 19:01:47]

Done.

+  // RenderFrameHost is resumed and can navigate. Note that for some synchronous

[clamy, 2016/08/31 18:23:21]

The Note... sentence seems to belong to the PlzNavigate part.

[scottmg, 2016/08/31 19:01:46]

Done.

+  // navigations (about:blank, javascript urls, etc.), no simulation of the
+  // network stack is required.
+  // PlzNavigate: This simulates a BeforeUnload ACK from the renderer, and the
+  // interaction with the IO thread up until the response is ready to commit.
+  virtual void PrepareForCommitIfNecessary() = 0;
+
   // Calls OnDidCommitProvisionalLoad on the RenderFrameHost with the given
   // information with various sets of parameters. These are helper functions for
   // simulating the most common types of loads.