Revert "Add option to export tracing events to ETW."

base/trace_event/BUILD.gn

Index: base/trace_event/BUILD.gn
diff --git a/base/trace_event/BUILD.gn b/base/trace_event/BUILD.gn
index 1ddaaea99437a52fa0cf0054051c29b8c7bacc52..c0c6a0579928568910d83f581dc37a1c57f0ffd0 100644
--- a/base/trace_event/BUILD.gn
+++ b/base/trace_event/BUILD.gn
@@ -26,8 +26,6 @@ source_set("trace_event") {
     "trace_event_android.cc",
     "trace_event_argument.cc",
     "trace_event_argument.h",
-    "trace_event_etw_export_win.cc",
-    "trace_event_etw_export_win.h",
     "trace_event_impl.cc",
     "trace_event_impl.h",
     "trace_event_impl_constants.cc",
@@ -58,10 +56,6 @@ source_set("trace_event") {
     "//base/third_party/dynamic_annotations",
   ]
 
-  if (is_win) {
-    deps += [ "//base/trace_event/etw_manifest:chrome_events_win" ]
-  }
-
   allow_circular_includes_from = [
     "//base/debug",
     "//base/memory",