Move ReadFileToString to the base namespace.

webkit/browser/fileapi/sandbox_isolated_origin_database_unittest.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 "base/basictypes.h"
 #include "base/file_util.h"
 #include "base/files/scoped_temp_dir.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "webkit/browser/fileapi/sandbox_isolated_origin_database.h"
 #include "webkit/browser/fileapi/sandbox_origin_database.h"
@@ skipping 58 matching lines @@
   EXPECT_TRUE(database.HasOriginPath(kOrigin));
   EXPECT_TRUE(database.GetPathForOrigin(kOrigin, &path));
   EXPECT_FALSE(path.empty());
 
   // The directory content must be kept (or migrated if necessary),
   // so we should see the same fake data.
   std::string origin_db_data;
   base::FilePath directory_db_path = dir.path().Append(path);
   EXPECT_TRUE(base::DirectoryExists(directory_db_path));
   EXPECT_TRUE(base::PathExists(directory_db_path.AppendASCII("dummy")));
-  EXPECT_TRUE(file_util::ReadFileToString(
+  EXPECT_TRUE(base::ReadFileToString(
       directory_db_path.AppendASCII("dummy"), &origin_db_data));
   EXPECT_EQ(kFakeDirectoryData, origin_db_data);
 
   // After the migration the database must be gone.
   EXPECT_FALSE(base::PathExists(old_db_path));
 }
 
 }  // namespace fileapi