Add new media request result MEDIA_DEVICE_FAILED_DUE_TO_SHUTDOWN.

extensions/browser/guest_view/web_view/web_view_permission_helper.cc

Index: extensions/browser/guest_view/web_view/web_view_permission_helper.cc
diff --git a/extensions/browser/guest_view/web_view/web_view_permission_helper.cc b/extensions/browser/guest_view/web_view/web_view_permission_helper.cc
index c99eddea501c7783d193dcc4b24678d1f3527f19..855ade185c346c4cd080cd5378f08f3768535b5c 100644
--- a/extensions/browser/guest_view/web_view/web_view_permission_helper.cc
+++ b/extensions/browser/guest_view/web_view/web_view_permission_helper.cc
@@ -196,6 +196,10 @@ bool WebViewPermissionHelper::CheckMediaAccessPermission(
     content::WebContents* source,
     const GURL& security_origin,
     content::MediaStreamType type) {
+  if (!web_view_guest()->attached() ||
+      !web_view_guest()->embedder_web_contents()->GetDelegate()) {
+    return false;
+  }
   return web_view_guest()
       ->embedder_web_contents()
       ->GetDelegate()
@@ -208,15 +212,19 @@ void WebViewPermissionHelper::OnMediaPermissionResponse(
     const content::MediaResponseCallback& callback,
     bool allow,
     const std::string& user_input) {
-  if (!allow || !web_view_guest()->attached()) {
-    // Deny the request.
+  if (!allow) {
     callback.Run(content::MediaStreamDevices(),
-                 content::MEDIA_DEVICE_INVALID_STATE,
+                 content::MEDIA_DEVICE_PERMISSION_DENIED,
                  scoped_ptr<content::MediaStreamUI>());
     return;
   }
-  if (!web_view_guest()->embedder_web_contents()->GetDelegate())
+  if (!web_view_guest()->attached() ||
+      !web_view_guest()->embedder_web_contents()->GetDelegate()) {
+    callback.Run(content::MediaStreamDevices(),
+                 content::MEDIA_DEVICE_INVALID_STATE,
+                 scoped_ptr<content::MediaStreamUI>());
     return;
+  }
 
   web_view_guest()
       ->embedder_web_contents()