Allow navigations performed by extensions to pass through AllowExtensionResourceLoad.

chrome/browser/extensions/extension_protocols.cc

Index: chrome/browser/extensions/extension_protocols.cc
diff --git a/chrome/browser/extensions/extension_protocols.cc b/chrome/browser/extensions/extension_protocols.cc
index 217afa83238ef10c5bead8fe22719a03ab59f6de..80250c6a030bc64f934cbbdfd3ca4624070d6cb0 100644
--- a/chrome/browser/extensions/extension_protocols.cc
+++ b/chrome/browser/extensions/extension_protocols.cc
@@ -385,6 +385,12 @@ bool AllowExtensionResourceLoad(net::URLRequest* request,
     return true;
   }
 
+  // If the request is for navigations outside of webviews, then it should be
+  // allowed. The navigation logic in CrossSiteResourceHandler will properly
+  // transfer the navigation to a privileged process before it commits.
+  if (ResourceType::IsFrame(info->GetResourceType()) && !is_guest)
+    return true;
+
   if (!content::PageTransitionIsWebTriggerable(info->GetPageTransition()))
     return false;