Enable startup tracing from command line flags in components/tracing

components/tracing/common/trace_config_file.h

 // Copyright (c) 2015 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.
 
-#ifndef COMPONENTS_TRACING_BROWSER_TRACE_CONFIG_FILE_H_
-#define COMPONENTS_TRACING_BROWSER_TRACE_CONFIG_FILE_H_
+#ifndef COMPONENTS_TRACING_COMMON_TRACE_CONFIG_FILE_H_
+#define COMPONENTS_TRACING_COMMON_TRACE_CONFIG_FILE_H_
 
 #include "base/files/file_path.h"
 #include "base/macros.h"
 #include "base/trace_event/trace_config.h"
 #include "build/build_config.h"
 #include "components/tracing/tracing_export.h"
 
 namespace base {
-template <typename Type> struct DefaultSingletonTraits;
+template <typename Type>
+struct DefaultSingletonTraits;
 }  // namespace base
 
 namespace tracing {
 
 // TraceConfigFile is a singleton that contains the configurations of tracing.
 // One can create a trace config file and use it to configure startup and/or
 // shutdown tracing.
 //
 // The trace config file should be JSON formated. One example is:
 //   {
@@ skipping 61 matching lines @@
   bool is_enabled_;
   base::trace_event::TraceConfig trace_config_;
   int startup_duration_;
   base::FilePath result_file_;
 
   DISALLOW_COPY_AND_ASSIGN(TraceConfigFile);
 };
 
 }  // namespace tracing
 
-#endif  // COMPONENTS_TRACING_BROWSER_TRACE_CONFIG_FILE_H_
+#endif  // COMPONENTS_TRACING_COMMON_TRACE_CONFIG_FILE_H_