[Extensions] Don't inject scripts into remote frames, null documents.

extensions/renderer/programmatic_script_injector.cc

Index: extensions/renderer/programmatic_script_injector.cc
diff --git a/extensions/renderer/programmatic_script_injector.cc b/extensions/renderer/programmatic_script_injector.cc
index 6e28bef510a3b53c1648f1dc96af66181df9c2d0..5e668ac49c38c05544827618680731d1c92abd5a 100644
--- a/extensions/renderer/programmatic_script_injector.cc
+++ b/extensions/renderer/programmatic_script_injector.cc
@@ -70,6 +70,10 @@ PermissionsData::AccessType ProgrammaticScriptInjector::CanExecuteOnFrame(
     blink::WebFrame* frame,
     int tab_id,
     const GURL& top_url) const {
+  // It doesn't make sense to inject a script into a remote frame or a frame
+  // with a null document.
+  if (frame->isWebRemoteFrame() || frame->document().isNull())
+    return PermissionsData::ACCESS_DENIED;
   GURL effective_document_url = ScriptContext::GetEffectiveDocumentURL(
       frame, frame->document().url(), params_->match_about_blank);
   if (params_->is_web_view) {