content: Rewrite trace event to use TRACE_DISABLED_BY_DEFAULT

Rewrite a trace event to use the TRACE_DISABLED_BY_DEFAULT macro instead
of manually spelling out the disabled category prefix string.

Bug: 1006541
Change-Id: I2759162549bcb4c562b0f86a62f8e4340092f68e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2627861
Commit-Queue: Sami Kyöstilä <skyostil@chromium.org>
Commit-Queue: Jonathan Ross <jonross@chromium.org>
Auto-Submit: Sami Kyöstilä <skyostil@chromium.org>
Reviewed-by: Jonathan Ross <jonross@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843709}

content/browser/renderer_host/render_widget_host_impl.cc

@@ -2417,7 +2417,7 @@ void RenderWidgetHostImpl::OnUpdateScreenRectsAck() {
 void RenderWidgetHostImpl::OnLocalSurfaceIdChanged(
     const cc::RenderFrameMetadata& metadata) {
   TRACE_EVENT_WITH_FLOW1(
-      "renderer_host,disabled-by-default-viz.surface_id_flow",
+      "renderer_host," TRACE_DISABLED_BY_DEFAULT("viz.surface_id_flow"),
       "RenderWidgetHostImpl::OnLocalSurfaceIdChanged",
       metadata.local_surface_id && metadata.local_surface_id->is_valid()
           ? metadata.local_surface_id->submission_trace_id() +