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

chrome/browser/sync_file_system/drive_backend/metadata_db_migration_util_unittest.cc

Index: chrome/browser/sync_file_system/drive_backend/metadata_db_migration_util_unittest.cc
diff --git a/chrome/browser/sync_file_system/drive_backend/metadata_db_migration_util_unittest.cc b/chrome/browser/sync_file_system/drive_backend/metadata_db_migration_util_unittest.cc
index da6eb5e080dd64b47bbc789e10f216687da6db31..b8f59e14c0b27dc33fab51ba2ffd8953b86248ce 100644
--- a/chrome/browser/sync_file_system/drive_backend/metadata_db_migration_util_unittest.cc
+++ b/chrome/browser/sync_file_system/drive_backend/metadata_db_migration_util_unittest.cc
@@ -4,10 +4,10 @@
 
 #include "chrome/browser/sync_file_system/drive_backend/metadata_db_migration_util.h"
 
+#include <memory>
 #include <string>
 
 #include "base/files/scoped_temp_dir.h"
-#include "base/memory/scoped_ptr.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
 #include "chrome/browser/sync_file_system/drive_backend/drive_backend_constants.h"
@@ -29,7 +29,8 @@ namespace {
 void VerifyKeyAndValue(const std::string& key,
                        const std::string& expect_val,
                        leveldb::DB* db) {
-  scoped_ptr<leveldb::Iterator> itr(db->NewIterator(leveldb::ReadOptions()));
+  std::unique_ptr<leveldb::Iterator> itr(
+      db->NewIterator(leveldb::ReadOptions()));
 
   itr->Seek(key);
   EXPECT_TRUE(itr->Valid());
@@ -37,7 +38,8 @@ void VerifyKeyAndValue(const std::string& key,
 }
 
 void VerifyNotExist(const std::string& key, leveldb::DB* db) {
-  scoped_ptr<leveldb::Iterator> itr(db->NewIterator(leveldb::ReadOptions()));
+  std::unique_ptr<leveldb::Iterator> itr(
+      db->NewIterator(leveldb::ReadOptions()));
 
   itr->Seek(key);
   EXPECT_TRUE(!itr->Valid() ||
@@ -80,7 +82,7 @@ TEST(DriveMetadataDBMigrationUtilTest, RollbackFromV4ToV3) {
     leveldb::Status status = leveldb::DB::Open(options, db_dir, &db_ptr);
     ASSERT_TRUE(status.ok());
   }
-  scoped_ptr<leveldb::DB> db(db_ptr);
+  std::unique_ptr<leveldb::DB> db(db_ptr);
 
   // Setup the database with the schema version 4, without IDs.
   leveldb::WriteBatch batch;