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

content/public/common/content_switches.cc

Index: content/public/common/content_switches.cc
diff --git a/content/public/common/content_switches.cc b/content/public/common/content_switches.cc
index d4fd0059371680b685d2fd6ff9b7885ebc91976c..17e95ef2bc2285555fe30e2ce15157a047eb9c3a 100644
--- a/content/public/common/content_switches.cc
+++ b/content/public/common/content_switches.cc
@@ -987,10 +987,6 @@ const char kEnableWin32kRendererLockDown[] =
 // This switch allows specifying suffix to shared memory section name to avoid
 // clashes between different instances of Chrome.
 const char kFontCacheSharedMemSuffix[] = "font-cache-shared-mem-suffix";
-
-// Enables the exporting of the tracing events to ETW. This is only supported on
-// Windows Vista and later.
-const char kTraceExportEventsToETW[] = "trace-export-events-to-etw";
 #endif
 
 // Enables the use of NPAPI plugins.