Modify sync unit test to use standard sql::test:: helper.

sql/test/test_helpers.cc

 // Copyright 2013 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/test/test_helpers.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <memory>
@@ skipping 81 matching lines @@
   CorruptSizeInHeaderMemory(header, db_size);
 
   if (0 != fseek(file.get(), 0, SEEK_SET))
     return false;
   if (1u != fwrite(header, sizeof(header), 1, file.get()))
     return false;
 
   return true;
 }
 
+bool CorruptSizeInHeaderWithLock(const base::FilePath& db_path) {
+  sql::Connection db;
+  if (!db.Open(db_path))
+    return false;
+
+  // Prevent anyone else from using the database.  The transaction is
+  // rolled back when |db| is destroyed.
+  if (!db.Execute("BEGIN EXCLUSIVE"))
+    return false;
+
+  return CorruptSizeInHeader(db_path);
+}
+
 void CorruptSizeInHeaderMemory(unsigned char* header, int64_t db_size) {
   const size_t kPageSizeOffset = 16;
   const size_t kFileChangeCountOffset = 24;
   const size_t kPageCountOffset = 28;
   const size_t kVersionValidForOffset = 92;  // duplicate kFileChangeCountOffset
 
   const unsigned page_size = ReadBigEndian(header + kPageSizeOffset, 2);
 
   // One larger than the expected size.
   const unsigned page_count =
@@ skipping 140 matching lines @@
   sql::Statement statement(db->GetUniqueStatement("PRAGMA integrity_check"));
 
   // SQLite should always return a row of data.
   EXPECT_TRUE(statement.Step());
 
   return statement.ColumnString(0);
 }
 
 }  // namespace test
 }  // namespace sql