Android: removes "trace_event_clock_sync" from atrace.

base/debug/trace_event_impl.cc

 // 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.
 
 #include "base/debug/trace_event_impl.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/debug/leak_annotations.h"
@@ skipping 554 matching lines @@
                     OnTraceLogWillDisable());
   dispatching_to_observer_list_ = false;
 
   included_categories_.clear();
   excluded_categories_.clear();
   watch_category_ = NULL;
   watch_event_name_ = "";
   for (int i = 0; i < g_category_index; i++)
     g_category_enabled[i] = 0;
   AddThreadNameMetadataEvents();
-#if defined(OS_ANDROID)
-  AddClockSyncMetadataEvents();
-#endif
 }
 
 void TraceLog::SetEnabled(bool enabled) {
   if (enabled)
     SetEnabled(std::vector<std::string>(), std::vector<std::string>());
   else
     SetDisabled();
 }
 
 void TraceLog::AddEnabledStateObserver(EnabledStateChangedObserver* listener) {
@@ skipping 206 matching lines @@
   unsigned long long pid = static_cast<unsigned long long>(process_id_);
   process_id_hash_ = (offset_basis ^ pid) * fnv_prime;
 }
 
 void TraceLog::SetTimeOffset(TimeDelta offset) {
   time_offset_ = offset;
 }
 
 }  // namespace debug
 }  // namespace base