Convert Pass()→std::move() for iOS build.

ios/chrome/browser/metrics/ios_chrome_metrics_service_client.cc

Index: ios/chrome/browser/metrics/ios_chrome_metrics_service_client.cc
diff --git a/ios/chrome/browser/metrics/ios_chrome_metrics_service_client.cc b/ios/chrome/browser/metrics/ios_chrome_metrics_service_client.cc
index 8decbb8e4677df53d6c3aa5e8aef7ee6f13c2c79..c9042497401bbfa0d630bf1e7269c36434a2f808 100644
--- a/ios/chrome/browser/metrics/ios_chrome_metrics_service_client.cc
+++ b/ios/chrome/browser/metrics/ios_chrome_metrics_service_client.cc
@@ -6,6 +6,7 @@
 
 #include <stdint.h>
 
+#include <utility>
 #include <vector>
 
 #include "base/bind.h"
@@ -97,7 +98,7 @@ scoped_ptr<IOSChromeMetricsServiceClient> IOSChromeMetricsServiceClient::Create(
       new IOSChromeMetricsServiceClient(state_manager));
   client->Initialize();
 
-  return client.Pass();
+  return client;
 }
 
 // static
@@ -254,7 +255,7 @@ void IOSChromeMetricsServiceClient::Initialize() {
       new IOSStabilityMetricsProvider(metrics_service_.get()));
   if (ios_stability_metrics_provider) {
     metrics_service_->RegisterMetricsProvider(
-        ios_stability_metrics_provider.Pass());
+        std::move(ios_stability_metrics_provider));
   } else {
     NOTREACHED() << "No IOSStabilityMetricsProvider registered.";
   }