Convert //chrome from scoped_ptr to std::unique_ptr

chrome/utility/importer/firefox_importer_unittest_utils_mac.cc

Index: chrome/utility/importer/firefox_importer_unittest_utils_mac.cc
diff --git a/chrome/utility/importer/firefox_importer_unittest_utils_mac.cc b/chrome/utility/importer/firefox_importer_unittest_utils_mac.cc
index 445f9dfda01b0bae70d2fe4ff805f3a86ae1f829..d727066512cb7ca47250069b4cac1621afed6a09 100644
--- a/chrome/utility/importer/firefox_importer_unittest_utils_mac.cc
+++ b/chrome/utility/importer/firefox_importer_unittest_utils_mac.cc
@@ -284,8 +284,8 @@ MULTIPROCESS_IPC_TEST_MAIN(NSSDecrypterChildProcess) {
   base::MessageLoopForIO main_message_loop;
   FFDecryptorClientChannelListener listener;
 
-  scoped_ptr<IPC::Channel> channel = IPC::Channel::CreateClient(
-      kTestChannelID, &listener);
+  std::unique_ptr<IPC::Channel> channel =
+      IPC::Channel::CreateClient(kTestChannelID, &listener);
   CHECK(channel->Connect());
   listener.SetSender(channel.get());