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

content/app/content_main_runner.cc

Index: content/app/content_main_runner.cc
diff --git a/content/app/content_main_runner.cc b/content/app/content_main_runner.cc
index 0db941a7a173b6e948706084a3ba2b5bf85d9871..42f1865ad5064e260e403cad4c8f451ec51aa28b 100644
--- a/content/app/content_main_runner.cc
+++ b/content/app/content_main_runner.cc
@@ -77,7 +77,6 @@
 #include <cstring>
 
 #include "base/strings/string_number_conversions.h"
-#include "base/trace_event/trace_event_etw_export_win.h"
 #include "ui/base/win/atl_module.h"
 #include "ui/gfx/win/dpi.h"
 #elif defined(OS_MACOSX)
@@ -633,12 +632,6 @@ class ContentMainRunnerImpl : public ContentMainRunner {
           base::trace_event::TraceOptions(
               base::trace_event::RECORD_UNTIL_FULL));
     }
-#if defined(OS_WIN)
-    // Enable exporting of events to ETW if requested on the command line.
-    if (command_line.HasSwitch(switches::kTraceExportEventsToETW))
-      base::trace_event::TraceEventETWExport::EnableETWExport();
-#endif  // OS_WIN
-
 #if !defined(OS_ANDROID)
     // Android tracing started at the beginning of the method.
     // Other OSes have to wait till we get here in order for all the memory