Update from https://crrev.com/304121

base/profiler/scoped_profile.h

 // Copyright (c) 2011 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 BASE_PROFILER_SCOPED_PROFILE_H_
 #define BASE_PROFILER_SCOPED_PROFILE_H_
 
 //------------------------------------------------------------------------------
 // ScopedProfile provides basic helper functions for profiling a short
 // region of code within a scope.  It is separate from the related ThreadData
 // class so that it can be included without much other cruft, and provide the
 // macros listed below.
 
 #include "base/base_export.h"
 #include "base/location.h"
 #include "base/profiler/tracked_time.h"
 #include "base/tracked_objects.h"
 
 #define PASTE_LINE_NUMBER_ON_NAME(name, line) name##line
 
 #define LINE_BASED_VARIABLE_NAME_FOR_PROFILING                                 \
     PASTE_LINE_NUMBER_ON_NAME(some_profiler_variable_, __LINE__)
 
 // Defines the containing scope as a profiled region. This allows developers to
 // profile their code and see results on their about:profiler page, as well as
 // on the UMA dashboard.
-#define TRACK_RUN_IN_THIS_SCOPED_REGION(dispatch_function_name)                \
-    ::tracked_objects::ScopedProfile LINE_BASED_VARIABLE_NAME_FOR_PROFILING(   \
-        FROM_HERE_WITH_EXPLICIT_FUNCTION(#dispatch_function_name))
-
+#define TRACK_RUN_IN_THIS_SCOPED_REGION(dispatch_function_name)            \
+  ::tracked_objects::ScopedProfile LINE_BASED_VARIABLE_NAME_FOR_PROFILING( \
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(#dispatch_function_name),           \
+      ::tracked_objects::ScopedProfile::ENABLED)
 
 namespace tracked_objects {
 class Births;
 
 class BASE_EXPORT ScopedProfile {
  public:
   // Mode of operation. Specifies whether ScopedProfile should be a no-op or
   // needs to create and tally a task.
   enum Mode {
     DISABLED,  // Do nothing.
     ENABLED    // Create and tally a task.
   };
 
-  // TODO(vadimt): Remove this constructor.
-  explicit ScopedProfile(const Location& location);
   ScopedProfile(const Location& location, Mode mode);
   ~ScopedProfile();
 
  private:
   Births* birth_;  // Place in code where tracking started.
   TaskStopwatch stopwatch_;
 
   DISALLOW_COPY_AND_ASSIGN(ScopedProfile);
 };
 
 }  // namespace tracked_objects
 
 #endif   // BASE_PROFILER_SCOPED_PROFILE_H_