Enable startup tracing from command line flags in components/tracing

components/tracing/common/trace_config_file.h

Index: components/tracing/common/trace_config_file.h
diff --git a/components/tracing/browser/trace_config_file.h b/components/tracing/common/trace_config_file.h
similarity index 94%
rename from components/tracing/browser/trace_config_file.h
rename to components/tracing/common/trace_config_file.h
index 06766d0ecd91fcc3a73d7ec21d0f25783c3b214c..31adcef508ce21c234b263cb47e242ea74696df5 100644
--- a/components/tracing/browser/trace_config_file.h
+++ b/components/tracing/common/trace_config_file.h
@@ -2,8 +2,8 @@
 // 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"
@@ -12,7 +12,8 @@
 #include "components/tracing/tracing_export.h"
 
 namespace base {
-template <typename Type> struct DefaultSingletonTraits;
+template <typename Type>
+struct DefaultSingletonTraits;
 }  // namespace base
 
 namespace tracing {
@@ -94,4 +95,4 @@ class TRACING_EXPORT TraceConfigFile {
 
 }  // namespace tracing
 
-#endif  // COMPONENTS_TRACING_BROWSER_TRACE_CONFIG_FILE_H_
+#endif  // COMPONENTS_TRACING_COMMON_TRACE_CONFIG_FILE_H_