Revert "Track thread activities in order to diagnose hangs."

base/process/process_win.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/process/process.h"
 
-#include "base/debug/activity_tracker.h"
 #include "base/logging.h"
 #include "base/numerics/safe_conversions.h"
 #include "base/process/kill.h"
 #include "base/win/windows_version.h"
 
 namespace {
 
 DWORD kBasicProcessAccess =
   PROCESS_TERMINATE | PROCESS_QUERY_INFORMATION | SYNCHRONIZE;
 
@@ skipping 118 matching lines @@
   }
   return result;
 }
 
 bool Process::WaitForExit(int* exit_code) {
   return WaitForExitWithTimeout(TimeDelta::FromMilliseconds(INFINITE),
                                 exit_code);
 }
 
 bool Process::WaitForExitWithTimeout(TimeDelta timeout, int* exit_code) {
-  // Record the event that this thread is blocking upon (for hang diagnosis).
-  base::debug::ScopedProcessWaitActivity process_activity(this);
-
   // Limit timeout to INFINITE.
   DWORD timeout_ms = saturated_cast<DWORD>(timeout.InMilliseconds());
   if (::WaitForSingleObject(Handle(), timeout_ms) != WAIT_OBJECT_0)
     return false;
 
   DWORD temp_code;  // Don't clobber out-parameters in case of failure.
   if (!::GetExitCodeProcess(Handle(), &temp_code))
     return false;
 
   if (exit_code)
@@ skipping 25 matching lines @@
 
   return (::SetPriorityClass(Handle(), priority) != 0);
 }
 
 int Process::GetPriority() const {
   DCHECK(IsValid());
   return ::GetPriorityClass(Handle());
 }
 
 }  // namespace base