Prefer ScopedNestableTaskAllower over manual save/restore

base/tracked_objects.h

 // 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.
 
 #ifndef BASE_TRACKED_OBJECTS_H_
 #define BASE_TRACKED_OBJECTS_H_
 #pragma once
 
 #include <map>
 #include <set>
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 // just adding a hack that Reset()s to zero all counts and stats.  This is also
 // done in a slighly thread-unsafe fashion, as the resetting is done
 // asynchronously relative to ongoing updates (but all data is 32 bit in size).
 // For basic profiling, this will work "most of the time," and should be
 // sufficient... but storing away DataCollections is the "right way" to do this.
 // We'll accomplish this via JavaScript storage of snapshots, and then we'll
 // remove the Reset() methods.  We may also need a short-term-max value in
 // DeathData that is reset (as synchronously as possible) during each snapshot.
 // This will facilitate displaying a max value for each snapshot period.
 
-class MessageLoop;
-
 namespace tracked_objects {
 
 //------------------------------------------------------------------------------
 // For a specific thread, and a specific birth place, the collection of all
 // death info (with tallies for each death thread, to prevent access conflicts).
 class ThreadData;
 class BASE_EXPORT BirthOnThread {
  public:
   BirthOnThread(const Location& location, const ThreadData& current);
 
@@ skipping 523 matching lines @@
   }
 
  private:
 
   DISALLOW_COPY_AND_ASSIGN(AutoTracking);
 };
 
 }  // namespace tracked_objects
 
 #endif  // BASE_TRACKED_OBJECTS_H_