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

sql/statement.h

 // 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.
 
 #ifndef SQL_STATEMENT_H_
 #define SQL_STATEMENT_H_
 
 #include <stdint.h>
 #include <string>
 #include <vector>
@@ skipping 121 matching lines @@
   int64_t ColumnInt64(int col) const;
   double ColumnDouble(int col) const;
   std::string ColumnString(int col) const;
   base::string16 ColumnString16(int col) const;
 
   // When reading a blob, you can get a raw pointer to the underlying data,
   // along with the length, or you can just ask us to copy the blob into a
   // vector. Danger! ColumnBlob may return NULL if there is no data!
   int ColumnByteLength(int col) const;
   const void* ColumnBlob(int col) const;
-  bool ColumnBlobAsString(int col, std::string* blob);
+  bool ColumnBlobAsString(int col, std::string* blob) const;
   bool ColumnBlobAsString16(int col, base::string16* val) const;
   bool ColumnBlobAsVector(int col, std::vector<char>* val) const;
   bool ColumnBlobAsVector(int col, std::vector<unsigned char>* val) const;
 
   // Diagnostics --------------------------------------------------------------
 
   // Returns the original text of sql statement. Do not keep a pointer to it.
   const char* GetSQLStatement();
 
  private:
@@ skipping 45 matching lines @@
 
   // See Succeeded() for what this holds.
   bool succeeded_;
 
   DISALLOW_COPY_AND_ASSIGN(Statement);
 };
 
 }  // namespace sql
 
 #endif  // SQL_STATEMENT_H_