Stop using the TRACE_EVENT_*_ETW macros.

content/browser/browser_main.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.h"
 
 #include "base/trace_event/trace_event.h"
 #include "content/common/content_constants_internal.h"
 #include "content/public/browser/browser_main_runner.h"
 
 namespace content {
 
+namespace {
+
+// Generates a pair of BrowserMain async events. We don't use the TRACE_EVENT0
+// macro because the tracing infrastructure doesn't expect synchronous events
+// around the main loop of a thread.
+class ScopedBrowserMainEvent {
+ public:
+  ScopedBrowserMainEvent() {
+    TRACE_EVENT_ASYNC_BEGIN0("startup", "BrowserMain", 0);
+  }
+  ~ScopedBrowserMainEvent() {
+    TRACE_EVENT_ASYNC_END0("startup", "BrowserMain", 0);
+  }
+};
+
+}  // namespace
+
 // Main routine for running as the Browser process.
 int BrowserMain(const MainFunctionParams& parameters) {
-  TRACE_EVENT_BEGIN_ETW("BrowserMain", 0, "");
+  ScopedBrowserMainEvent scoped_browser_main_event;
+
   base::trace_event::TraceLog::GetInstance()->SetProcessName("Browser");
   base::trace_event::TraceLog::GetInstance()->SetProcessSortIndex(
       kTraceEventBrowserProcessSortIndex);
 
   scoped_ptr<BrowserMainRunner> main_runner(BrowserMainRunner::Create());
 
   int exit_code = main_runner->Initialize(parameters);
   if (exit_code >= 0)
     return exit_code;
 
   exit_code = main_runner->Run();
 
   main_runner->Shutdown();
 
-  TRACE_EVENT_END_ETW("BrowserMain", 0, 0);
-
   return exit_code;
 }
 
 }  // namespace content