Remove base/metrics/* code from NaCl IPC proxy build.

base/message_loop.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/message_loop.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/compiler_specific.h"
@@ skipping 602 matching lines @@
   // ScheduleWork outside of incoming_queue_lock_.
 
   pump->ScheduleWork();
 }
 
 //------------------------------------------------------------------------------
 // Method and data for histogramming events and actions taken by each instance
 // on each thread.
 
 void MessageLoop::StartHistogrammer() {
+#if !defined(OS_NACL)  // NaCl build has no metrics code.
   if (enable_histogrammer_ && !message_histogram_
       && base::StatisticsRecorder::IsActive()) {
     DCHECK(!thread_name_.empty());
     message_histogram_ = base::LinearHistogram::FactoryGet(
         "MsgLoop:" + thread_name_,
         kLeastNonZeroMessageId, kMaxMessageId,
         kNumberOfDistinctMessagesDisplayed,
         message_histogram_->kHexRangePrintingFlag);
     message_histogram_->SetRangeDescriptions(event_descriptions_);
   }
+#endif
 }
 
 void MessageLoop::HistogramEvent(int event) {
+#if !defined(OS_NACL)
   if (message_histogram_)
     message_histogram_->Add(event);
+#endif
 }
 
 bool MessageLoop::DoWork() {
   if (!nestable_tasks_allowed_) {
     // Task can't be executed right now.
     return false;
   }
 
   for (;;) {
     ReloadWorkQueue();
@@ skipping 133 matching lines @@
                                            Watcher *delegate) {
   return pump_libevent()->WatchFileDescriptor(
       fd,
       persistent,
       static_cast<base::MessagePumpLibevent::Mode>(mode),
       controller,
       delegate);
 }
 
 #endif