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

sql/statement.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "sql/statement.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include "base/logging.h"
@@ skipping 276 matching lines @@
   return sqlite3_column_bytes(ref_->stmt(), col);
 }
 
 const void* Statement::ColumnBlob(int col) const {
   if (!CheckValid())
     return NULL;
 
   return sqlite3_column_blob(ref_->stmt(), col);
 }
 
-bool Statement::ColumnBlobAsString(int col, std::string* blob) {
+bool Statement::ColumnBlobAsString(int col, std::string* blob) const {
   if (!CheckValid())
     return false;
 
   const void* p = ColumnBlob(col);
   size_t len = ColumnByteLength(col);
   blob->resize(len);
   if (blob->size() != len) {
     return false;
   }
   blob->assign(reinterpret_cast<const char*>(p), len);
@@ skipping 49 matching lines @@
 
 int Statement::CheckError(int err) {
   // Please don't add DCHECKs here, OnSqliteError() already has them.
   succeeded_ = (err == SQLITE_OK || err == SQLITE_ROW || err == SQLITE_DONE);
   if (!succeeded_ && ref_.get() && ref_->connection())
     return ref_->connection()->OnSqliteError(err, this, NULL);
   return err;
 }
 
 }  // namespace sql