Enable Runtime Memory Leak Detector on x86_64 only

chrome/browser/metrics/chromeos_metrics_provider.cc

Index: chrome/browser/metrics/chromeos_metrics_provider.cc
diff --git a/chrome/browser/metrics/chromeos_metrics_provider.cc b/chrome/browser/metrics/chromeos_metrics_provider.cc
index baa8917d0c4e4af47aa4864a03d1984ea1a5477c..68d84c27a8bf54e17a755d25b0002dcea1f7e46c 100644
--- a/chrome/browser/metrics/chromeos_metrics_provider.cc
+++ b/chrome/browser/metrics/chromeos_metrics_provider.cc
@@ -145,9 +145,13 @@ ChromeOSMetricsProvider::GetEnrollmentStatus() {
 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() {