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

ios/chrome/browser/sync/ios_chrome_sync_client.cc

Index: ios/chrome/browser/sync/ios_chrome_sync_client.cc
diff --git a/ios/chrome/browser/sync/ios_chrome_sync_client.cc b/ios/chrome/browser/sync/ios_chrome_sync_client.cc
index b6f7858bdfdcddee6bfad4a7d431f7045a526a53..164a04dd0b0851563d14038bf66ea4cf1b7f1bd4 100644
--- a/ios/chrome/browser/sync/ios_chrome_sync_client.cc
+++ b/ios/chrome/browser/sync/ios_chrome_sync_client.cc
@@ -4,6 +4,8 @@
 
 #include "ios/chrome/browser/sync/ios_chrome_sync_client.h"
 
+#include <utility>
+
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/macros.h"
@@ -377,5 +379,5 @@ void IOSChromeSyncClient::ClearBrowsingData(base::Time start, base::Time end) {
 
 void IOSChromeSyncClient::SetSyncApiComponentFactoryForTesting(
     scoped_ptr<sync_driver::SyncApiComponentFactory> component_factory) {
-  component_factory_ = component_factory.Pass();
+  component_factory_ = std::move(component_factory);
 }