Minor fixes in login_database.* and sql/statement.*

components/password_manager/core/browser/login_database.h

Index: components/password_manager/core/browser/login_database.h
diff --git a/components/password_manager/core/browser/login_database.h b/components/password_manager/core/browser/login_database.h
index c992f3eb159e7c18882efab2cf68e33db957d121..fed4a2786c2b32b7457c0a9632d542841e6656a6 100644
--- a/components/password_manager/core/browser/login_database.h
+++ b/components/password_manager/core/browser/login_database.h
@@ -36,7 +36,7 @@ extern const int kCompatibleVersionNumber;
 // the login information.
 class LoginDatabase {
  public:
-  LoginDatabase(const base::FilePath& db_path);
+  explicit LoginDatabase(const base::FilePath& db_path);
   virtual ~LoginDatabase();
 
   // Actually creates/opens the database. If false is returned, no other method
@@ -179,7 +179,7 @@ class LoginDatabase {
   // ENCRYPTION_RESULT_SUCCESS, |form| is not filled.
   static EncryptionResult InitPasswordFormFromStatement(
       autofill::PasswordForm* form,
-      sql::Statement& s);
+      const sql::Statement& s);
 
   // Gets all blacklisted or all non-blacklisted (depending on |blacklisted|)
   // credentials. On success returns true and overwrites |forms| with the