profiler: cleanup unused alternate_timer code

base/tracked_objects.h

Index: base/tracked_objects.h
diff --git a/base/tracked_objects.h b/base/tracked_objects.h
index 1a00ec0be05ec5e999abb52d5de74ef4fe609564..8f44f16a840422d9e326af38d9c32b72741c6f9e 100644
--- a/base/tracked_objects.h
+++ b/base/tracked_objects.h
@@ -22,7 +22,6 @@
 #include "base/location.h"
 #include "base/macros.h"
 #include "base/process/process_handle.h"
-#include "base/profiler/alternate_timer.h"
 #include "base/profiler/tracked_time.h"
 #include "base/synchronization/lock.h"
 #include "base/threading/thread_checker.h"
@@ -446,6 +445,7 @@ class BASE_EXPORT ThreadData {
     STATUS_LAST = PROFILING_ACTIVE
   };
 
+  typedef unsigned int NowFunction();  // Type for an alternate timer function.

[Ilya Sherman, 2016/01/28 01:36:47]

Why is this needed?

[Primiano Tucci (use gerrit), 2016/01/28 10:46:36]

This was previously in alternate_timer.h, which I am now removing.
The code below needs this.

[Ilya Sherman, 2016/01/29 01:23:14]

Is it just used for testing?  If so, let's not expose it as part of the public
API.

[Primiano Tucci (use gerrit), 2016/02/01 13:34:19]

Good point. Just testing. Done.

   typedef base::hash_map<Location, Births*, Location::Hash> BirthMap;
   typedef std::map<const Births*, DeathData> DeathMap;