Fix a regression where extension APIs would sometimes not be available on the

content/browser/renderer_host/render_view_host.cc

Index: content/browser/renderer_host/render_view_host.cc
diff --git a/content/browser/renderer_host/render_view_host.cc b/content/browser/renderer_host/render_view_host.cc
index f5aa764a43496602608dc2c3eac4cd63aafc62d1..b3f4921bb17b68ab4c66b22045c8c497f0798765 100644
--- a/content/browser/renderer_host/render_view_host.cc
+++ b/content/browser/renderer_host/render_view_host.cc
@@ -111,6 +111,8 @@ RenderViewHost::RenderViewHost(SiteInstance* instance,
   DCHECK(instance_);
   CHECK(delegate_);  // http://crbug.com/82827
 
+  process()->PrepareForReuse();

[Charlie Reis, 2011/06/22 00:52:31]

Just as a sanity check, is it definitely the case that we want to support
sending messages to RPH before Init is called?  If so, then I think this is
right.  Just wanted to be sure it wasn't cleaner to wait until Init before
sending messages.

[Matt Perry, 2011/06/22 21:14:12]

I think so. is_initialized_ was originally added expressly for this purpose (we
just didn't reset it properly).

+
   content::GetContentClient()->browser()->RenderViewHostCreated(this);
 
   NotificationService::current()->Notify(