Enable Runtime Memory Leak Detector on x86_64 only

chrome/browser/metrics/chromeos_metrics_provider.cc

 // Copyright 2014 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 "chrome/browser/metrics/chromeos_metrics_provider.h"
 
 #include <stddef.h>
 
 #include "base/feature_list.h"
 #include "base/strings/string_number_conversions.h"
@@ skipping 127 matching lines @@
       g_browser_process->platform_part()->browser_policy_connector_chromeos();
   if (!connector)
     return ERROR_GETTING_ENROLLMENT_STATUS;
 
   return connector->IsEnterpriseManaged() ? MANAGED : NON_MANAGED;
 }
 
 void ChromeOSMetricsProvider::Init() {
   perf_provider_.Init();
 
+#if defined(ARCH_CPU_X86_64)
+  // Currently, the runtime memory leak detector is only supported on x86_64
+  // systems.
   if (base::FeatureList::IsEnabled(features::kRuntimeMemoryLeakDetector)) {
     leak_detector_controller_.reset(new metrics::LeakDetectorController);
   }
+#endif
 }
 
 void ChromeOSMetricsProvider::OnDidCreateMetricsLog() {
   registered_user_count_at_log_initialization_ = false;
   if (user_manager::UserManager::IsInitialized()) {
     registered_user_count_at_log_initialization_ = true;
     user_count_at_log_initialization_ =
         user_manager::UserManager::Get()->GetLoggedInUsers().size();
   }
 }
@@ skipping 152 matching lines @@
     base::Closure callback,
     scoped_refptr<device::BluetoothAdapter> adapter) {
   adapter_ = adapter;
   callback.Run();
 }
 
 void ChromeOSMetricsProvider::RecordEnrollmentStatus() {
   UMA_HISTOGRAM_ENUMERATION(
       "UMA.EnrollmentStatus", GetEnrollmentStatus(), ENROLLMENT_STATUS_MAX);
 }