Garbage Collect the Storage directory on next profile start after an extension uninstall.

content/browser/renderer_host/render_process_host_impl.cc

Index: content/browser/renderer_host/render_process_host_impl.cc
diff --git a/content/browser/renderer_host/render_process_host_impl.cc b/content/browser/renderer_host/render_process_host_impl.cc
index d50a905e1f19eeb73c3b91d4fce35902ef496efb..677bc0d75f3d96eb839764aa112803d2a6fef4cb 100644
--- a/content/browser/renderer_host/render_process_host_impl.cc
+++ b/content/browser/renderer_host/render_process_host_impl.cc
@@ -1401,7 +1401,7 @@ RenderProcessHost* RenderProcessHostImpl::GetProcessHostForSite(
 
   // See if we have an existing process for this site.  If not, the caller
   // should create a new process and register it.
-  std::string site = SiteInstanceImpl::GetSiteForURL(browser_context, url)
+  std::string site = SiteInstance::GetSiteForURL(browser_context, url)
       .possibly_invalid_spec();
   return map->FindProcess(site);
 }
@@ -1417,7 +1417,7 @@ void RenderProcessHostImpl::RegisterProcessHostForSite(
   // TODO(creis): Determine if it's better to allow registration of
   // empty sites or not.  For now, group anything from which we can't parse
   // a site into the same process, when using --process-per-site.
-  std::string site = SiteInstanceImpl::GetSiteForURL(browser_context, url)
+  std::string site = SiteInstance::GetSiteForURL(browser_context, url)
       .possibly_invalid_spec();
   map->RegisterProcess(site, process);
 }