[flutter_runner] Fix crasher in code that handles a missing handler

Change-Id: I7165d2bf13775cb68e2124b8e643ef52869527ee
diff --git a/runtime/flutter_runner/platform_view.cc b/runtime/flutter_runner/platform_view.cc
index f21d7f7..1aad5bb 100644
--- a/runtime/flutter_runner/platform_view.cc
+++ b/runtime/flutter_runner/platform_view.cc
@@ -655,11 +655,11 @@
   }
   auto found = platform_message_handlers_.find(message->channel());
   if (found == platform_message_handlers_.end()) {
-    FML_DLOG(ERROR)
+    FML_LOG(ERROR)
         << "Platform view received message on channel '" << message->channel()
         << "' with no registed handler. And empty response will be generated. "
            "Please implement the native message handler.";
-    PlatformView::HandlePlatformMessage(std::move(message));
+    shell::PlatformView::HandlePlatformMessage(std::move(message));
     return;
   }
   found->second(std::move(message));