Stop using the TRACE_EVENT_*_ETW macros.

content/browser/browser_main_loop.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/browser_main_loop.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/location.h"
 #include "base/logging.h"
@@ skipping 887 matching lines @@
   }
 
   // If the UI thread blocks, the whole UI is unresponsive.
   // Do not allow disk IO from the UI thread.
   base::ThreadRestrictions::SetIOAllowed(false);
   base::ThreadRestrictions::DisallowWaiting();
   return result_code_;
 }
 
 void BrowserMainLoop::RunMainMessageLoopParts() {
-  TRACE_EVENT_BEGIN_ETW("BrowserMain:MESSAGE_LOOP", 0, "");
+  // Don't use the TRACE_EVENT0 macro because the tracing infrastructure doesn't
+  // expect synchronous events around the main loop of a thread.
+  TRACE_EVENT_ASYNC_BEGIN0("toplevel", "BrowserMain:MESSAGE_LOOP", this);
 
   bool ran_main_loop = false;
   if (parts_)
     ran_main_loop = parts_->MainMessageLoopRun(&result_code_);
 
   if (!ran_main_loop)
     MainMessageLoopRun();
 
-  TRACE_EVENT_END_ETW("BrowserMain:MESSAGE_LOOP", 0, "");
+  TRACE_EVENT_ASYNC_END0("toplevel", "BrowserMain:MESSAGE_LOOP", this);
 }
 
 void BrowserMainLoop::ShutdownThreadsAndCleanUp() {
   if (!created_threads_) {
     // Called early, nothing to do
     return;
   }
   TRACE_EVENT0("shutdown", "BrowserMainLoop::ShutdownThreadsAndCleanUp");
 
   // Teardown may start in PostMainMessageLoopRun, and during teardown we
@@ skipping 478 matching lines @@
   DCHECK(is_tracing_startup_for_duration_);
 
   is_tracing_startup_for_duration_ = false;
   TracingController::GetInstance()->DisableRecording(
       TracingController::CreateFileSink(
           startup_trace_file_,
           base::Bind(OnStoppedStartupTracing, startup_trace_file_)));
 }
 
 }  // namespace content