Move ReadFileToString to the base namespace.

webkit/browser/fileapi/sandbox_isolated_origin_database_unittest.cc

Index: webkit/browser/fileapi/sandbox_isolated_origin_database_unittest.cc
diff --git a/webkit/browser/fileapi/sandbox_isolated_origin_database_unittest.cc b/webkit/browser/fileapi/sandbox_isolated_origin_database_unittest.cc
index 7eeab2185b64a101cf91754451f9b8d8db842152..aad2c7e6cc33c03cad2274bed8d54d5a7399b317 100644
--- a/webkit/browser/fileapi/sandbox_isolated_origin_database_unittest.cc
+++ b/webkit/browser/fileapi/sandbox_isolated_origin_database_unittest.cc
@@ -76,7 +76,7 @@ TEST(SandboxIsolatedOriginDatabaseTest, MigrationTest) {
   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);