Create the correct SiteInstance when restoring tabs that belong to apps.

chrome/browser/chrome_content_browser_client.cc

Index: chrome/browser/chrome_content_browser_client.cc
diff --git a/chrome/browser/chrome_content_browser_client.cc b/chrome/browser/chrome_content_browser_client.cc
index c2f46ad2e92a0636387896c85cc32a18753b9447..16456aaeb3a3e1e38c39dbba69d0855cff6322bc 100644
--- a/chrome/browser/chrome_content_browser_client.cc
+++ b/chrome/browser/chrome_content_browser_client.cc
@@ -83,7 +83,6 @@ void InitRenderViewHostForExtensions(RenderViewHost* render_view_host) {
   // chrome-extension:// URL for their site, so we can ignore that wrinkle here.
   SiteInstance* site_instance = render_view_host->site_instance();
   const GURL& site = site_instance->site();
-  RenderProcessHost* process = render_view_host->process();
 
   if (!site.SchemeIs(chrome::kExtensionScheme))
     return;
@@ -110,6 +109,8 @@ void InitRenderViewHostForExtensions(RenderViewHost* render_view_host) {
   process_manager->RegisterExtensionSiteInstance(site_instance->id(),
                                                  extension->id());
 
+  RenderProcessHost* process = render_view_host->process();
+
   if (extension->is_app()) {
     render_view_host->Send(
         new ExtensionMsg_ActivateApplication(extension->id()));