Cleanup: Replace 'DurationInt' with int32, and always use 32-bit integers for tracking time.

base/profiler/tracked_time.cc

 // 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.
 
 #include "base/profiler/tracked_time.h"
 
 #include "build/build_config.h"
 
 #if defined(OS_WIN)
 #include <mmsystem.h>  // Declare timeGetTime()... after including build_config.
 #endif
 
 namespace tracked_objects {
 
-#if defined(USE_FAST_TIME_CLASS_FOR_DURATION_CALCULATIONS)
-
 Duration::Duration() : ms_(0) {}
 Duration::Duration(int32 duration) : ms_(duration) {}
 
 Duration& Duration::operator+=(const Duration& other) {
   ms_ += other.ms_;
   return *this;
 }
 
 Duration Duration::operator+(const Duration& other) const {
   return Duration(ms_ + other.ms_);
@@ skipping 41 matching lines @@
 Duration TrackedTime::operator-(const TrackedTime& other) const {
   return Duration(ms_ - other.ms_);
 }
 
 TrackedTime TrackedTime::operator+(const Duration& other) const {
   return TrackedTime(ms_ + other.ms_);
 }
 
 bool TrackedTime::is_null() const { return ms_ == 0; }
 
-#endif  // USE_FAST_TIME_CLASS_FOR_DURATION_CALCULATIONS
-
 }  // namespace tracked_objects