Don't close crashed tabs from extensions with background pages.

chrome/browser/renderer_host/chrome_render_view_host_observer.cc

Index: chrome/browser/renderer_host/chrome_render_view_host_observer.cc
diff --git a/chrome/browser/renderer_host/chrome_render_view_host_observer.cc b/chrome/browser/renderer_host/chrome_render_view_host_observer.cc
index 586ecdab8e907750bb0fc7323156cd2355f8b47c..cb924d3b6b035ffe2eaaf658f3879f7af9d0e5d0 100644
--- a/chrome/browser/renderer_host/chrome_render_view_host_observer.cc
+++ b/chrome/browser/renderer_host/chrome_render_view_host_observer.cc
@@ -139,7 +139,15 @@ const Extension* ChromeRenderViewHostObserver::GetExtension() {
   if (!service)
     return NULL;
 
-  // May be null if somebody typos a chrome-extension:// URL.
+  // Reload the extension if it has crashed.
+  // TODO(yoz): This reload doesn't happen synchronously for unpacked
+  //            extensions. It seems to be fast enough, but there is a race.
+  //            We should delay loading until the extension has reloaded.
+  if (service->GetTerminatedExtension(site.host()))
+    service->ReloadExtension(site.host());
+
+  // May be null if the extension doesn't exist, for example if somebody typos
+  // a chrome-extension:// URL.
   return service->GetExtensionByURL(site);
 }