Really fix build after r193020.

content/test/layout_browsertest.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 "content/test/layout_browsertest.h"
 
 #include <sstream>
 
 #include "base/command_line.h"
 #include "base/file_util.h"
@@ skipping 178 matching lines @@
         SaveResults(expected_text, actual_text);
   } else {
     EXPECT_EQ(expected_text, actual_text);
   }
 }
 
 std::string InProcessBrowserLayoutTest::SaveResults(const std::string& expected,
                                                     const std::string& actual) {
   base::FilePath cwd;
   EXPECT_TRUE(file_util::CreateNewTempDirectory(
-      FILE_PATH_LITERAL(std::string()), &cwd));
+      base::FilePath::StringType(), &cwd));
   base::FilePath expected_filename =
       cwd.Append(FILE_PATH_LITERAL("expected.txt"));
   base::FilePath actual_filename = cwd.Append(FILE_PATH_LITERAL("actual.txt"));
   EXPECT_NE(-1, file_util::WriteFile(expected_filename,
                                      expected.c_str(),
                                      expected.size()));
   EXPECT_NE(-1, file_util::WriteFile(actual_filename,
                                      actual.c_str(),
                                      actual.size()));
   return base::StringPrintf("Wrote %"PRFilePath" %"PRFilePath,
                             expected_filename.value().c_str(),
                             actual_filename.value().c_str());
 }
 
 }  // namespace content