Hooked the trace event argument whitelist up to the background_trace_manager

content/browser/tracing/tracing_controller_impl_data_sinks.cc

Index: content/browser/tracing/tracing_controller_impl_data_sinks.cc
diff --git a/content/browser/tracing/tracing_controller_impl_data_sinks.cc b/content/browser/tracing/tracing_controller_impl_data_sinks.cc
index a6d6e37ad1398a4df0772058d9f76cbd2bfa6eef..ca7b4f96fa8e491eaf5528f65e724828ef73fa23 100644
--- a/content/browser/tracing/tracing_controller_impl_data_sinks.cc
+++ b/content/browser/tracing/tracing_controller_impl_data_sinks.cc
@@ -281,6 +281,12 @@ TracingController::CreateStringSink(
 }
 
 scoped_refptr<TracingController::TraceDataSink>
+TracingController::CreateStringSink(
+    scoped_refptr<TracingController::TraceDataEndpoint> endpoint) {
+  return new StringTraceDataSink(endpoint);
+}
+
+scoped_refptr<TracingController::TraceDataSink>
 TracingController::CreateCompressedStringSink(
     scoped_refptr<TracingController::TraceDataEndpoint> endpoint) {
   return new CompressedStringTraceDataSink(endpoint);