Move process-per-site logic from BrowsingInstance to RenderProcessHost.

content/test/test_renderer_host.cc

Index: content/test/test_renderer_host.cc
diff --git a/content/test/test_renderer_host.cc b/content/test/test_renderer_host.cc
index ee1adf2aa98e029b299646773de98e317e810675..b827d687cef6e69d9177cdf6bf4571423f182cf8 100644
--- a/content/test/test_renderer_host.cc
+++ b/content/test/test_renderer_host.cc
@@ -143,6 +143,10 @@ void RenderViewHostTestHarness::TearDown() {
   // before we destroy the browser context.
   MessageLoop::current()->RunAllPending();
 
+  // Delete any RenderProcessHosts before the BrowserContext goes away.
+  if (rvh_test_enabler_.rph_factory_.get())
+    rvh_test_enabler_.rph_factory_.reset();
+
   // Release the browser context on the UI thread.
   message_loop_.DeleteSoon(FROM_HERE, browser_context_.release());
   message_loop_.RunAllPending();