Do not kill renderer when enumerateDevices is called from about:blank.

content/browser/renderer_host/media/media_stream_manager.cc

Index: content/browser/renderer_host/media/media_stream_manager.cc
diff --git a/content/browser/renderer_host/media/media_stream_manager.cc b/content/browser/renderer_host/media/media_stream_manager.cc
index 28fd3dfd9da939c95de268b7bff8135763cc41dd..b9641e079e9ecb950fc92ccf6587d0c8f2df4cb2 100644
--- a/content/browser/renderer_host/media/media_stream_manager.cc
+++ b/content/browser/renderer_host/media/media_stream_manager.cc
@@ -1974,7 +1974,8 @@ bool MediaStreamManager::IsOriginAllowed(int render_process_id,
                                          const url::Origin& origin) {
   if (!ChildProcessSecurityPolicyImpl::GetInstance()->CanRequestURL(
           render_process_id, origin.GetURL())) {
-    LOG(ERROR) << "MSM: Renderer requested a URL it's not allowed to use.";
+    LOG(ERROR) << "MSM: Renderer requested a URL it's not allowed to use: "
+               << origin.Serialize();
     return false;
   }