Clear UIThreadExtensionFunction::render_frame_host_ when RFH is gone.

extensions/browser/extension_function.cc

Index: extensions/browser/extension_function.cc
diff --git a/extensions/browser/extension_function.cc b/extensions/browser/extension_function.cc
index 98ef88f9ca8cd02a8c68a04814ca032b73a84721..b5a58e947cad2555e4c2b8cdc1f9cb34eb852999 100644
--- a/extensions/browser/extension_function.cc
+++ b/extensions/browser/extension_function.cc
@@ -425,8 +425,8 @@ void ExtensionFunction::OnRespondingLater(ResponseValue value) {
 UIThreadExtensionFunction::UIThreadExtensionFunction()
     : context_(nullptr),
       render_frame_host_(nullptr),
-      delegate_(nullptr) {
-}
+      is_from_service_worker_(false),
+      delegate_(nullptr) {}
 
 UIThreadExtensionFunction::~UIThreadExtensionFunction() {
   if (dispatcher() && render_frame_host())
@@ -454,8 +454,11 @@ UIThreadExtensionFunction::render_view_host_do_not_use() const {
 void UIThreadExtensionFunction::SetRenderFrameHost(
     content::RenderFrameHost* render_frame_host) {
   // An extension function from Service Worker does not have a RenderFrameHost.
-  if (!render_frame_host)
+  if (is_from_service_worker_) {
+    DCHECK(!render_frame_host);
     return;
+  }
+
   DCHECK_NE(render_frame_host_ == nullptr, render_frame_host == nullptr);
   render_frame_host_ = render_frame_host;
   tracker_.reset(