Convert //chrome/browser/chromeos from scoped_ptr to std::unique_ptr

chrome/browser/chromeos/login/supervised/supervised_user_authentication.cc

Index: chrome/browser/chromeos/login/supervised/supervised_user_authentication.cc
diff --git a/chrome/browser/chromeos/login/supervised/supervised_user_authentication.cc b/chrome/browser/chromeos/login/supervised/supervised_user_authentication.cc
index 7fcd6e86fc33f7b3e080d34528aeacecdfcecbb5..924b810b36e1b4f67d6cff12d7253623fdf371a3 100644
--- a/chrome/browser/chromeos/login/supervised/supervised_user_authentication.cc
+++ b/chrome/browser/chromeos/login/supervised/supervised_user_authentication.cc
@@ -45,8 +45,9 @@ std::string CreateSalt() {
 }
 
 std::string BuildRawHMACKey() {
-  scoped_ptr<crypto::SymmetricKey> key(crypto::SymmetricKey::GenerateRandomKey(
-      crypto::SymmetricKey::AES, kHMACKeySizeInBits));
+  std::unique_ptr<crypto::SymmetricKey> key(
+      crypto::SymmetricKey::GenerateRandomKey(crypto::SymmetricKey::AES,
+                                              kHMACKeySizeInBits));
   std::string raw_result, result;
   key->GetRawKey(&raw_result);
   base::Base64Encode(raw_result, &result);
@@ -58,7 +59,7 @@ base::DictionaryValue* LoadPasswordData(base::FilePath profile_dir) {
       profile_dir.Append(kPasswordUpdateFile));
   std::string error_message;
   int error_code = JSONFileValueDeserializer::JSON_NO_ERROR;
-  scoped_ptr<base::Value> value =
+  std::unique_ptr<base::Value> value =
       deserializer.Deserialize(&error_code, &error_message);
   if (JSONFileValueDeserializer::JSON_NO_ERROR != error_code) {
     LOG(ERROR) << "Could not deserialize password data, error = " << error_code