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diff --git a/base/profiler/tracked_time.h b/base/profiler/tracked_time.h
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-// 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_TRACKED_TIME_H_
-#define BASE_PROFILER_TRACKED_TIME_H_
-
-
-#include "base/base_export.h"
-#include "base/basictypes.h"
-#include "base/time.h"
-
-namespace tracked_objects {
-
-//------------------------------------------------------------------------------
-
-#define USE_FAST_TIME_CLASS_FOR_DURATION_CALCULATIONS
-
-#if defined(USE_FAST_TIME_CLASS_FOR_DURATION_CALCULATIONS)
-
-// TimeTicks maintains a wasteful 64 bits of data (we need less than 32), and on
-// windows, a 64 bit timer is expensive to even obtain. We use a simple
-// millisecond counter for most of our time values, as well as millisecond units
-// of duration between those values. This means we can only handle durations
-// up to 49 days (range), or 24 days (non-negative time durations).
-// We only define enough methods to service the needs of the tracking classes,
-// and our interfaces are modeled after what TimeTicks and TimeDelta use (so we
-// can swap them into place if we want to use the "real" classes).
-
-class BASE_EXPORT Duration { // Similar to base::TimeDelta.
- public:
- Duration();
-
- Duration& operator+=(const Duration& other);
- Duration operator+(const Duration& other) const;
-
- bool operator==(const Duration& other) const;
- bool operator!=(const Duration& other) const;
- bool operator>(const Duration& other) const;
-
- static Duration FromMilliseconds(int ms);
-
- int32 InMilliseconds() const;
-
- private:
- friend class TrackedTime;
- explicit Duration(int32 duration);
-
- // Internal time is stored directly in milliseconds.
- int32 ms_;
-};
-
-class BASE_EXPORT TrackedTime { // Similar to base::TimeTicks.
- public:
- TrackedTime();
- explicit TrackedTime(const base::TimeTicks& time);
-
- static TrackedTime Now();
- Duration operator-(const TrackedTime& other) const;
- TrackedTime operator+(const Duration& other) const;
- bool is_null() const;
-
- private:
- friend class Duration;
- explicit TrackedTime(int32 ms);
-
- // Internal duration is stored directly in milliseconds.
- uint32 ms_;
-};
-
-#else
-
-// Just use full 64 bit time calculations, and the slower TimeTicks::Now().
-// This allows us (as an alternative) to test with larger ranges of times, and
-// with a more thoroughly tested class.
-
-typedef base::TimeTicks TrackedTime;
-typedef base::TimeDelta Duration;
-
-#endif // USE_FAST_TIME_CLASS_FOR_DURATION_CALCULATIONS
-
-} // namespace tracked_objects
-
-#endif // BASE_PROFILER_TRACKED_TIME_H_