Add FilePath to base namespace.

chrome/test/logging/win/log_file_printer.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.
 
 // Prints log files produced by Event Tracing for Windows (by way of the
 // FileLogger class) that contain events generated from a select few supported
 // providers; see file_logger_win.h for the list.
 
 #ifndef CHROME_TEST_LOGGING_WIN_LOG_FILE_PRINTER_H_
 #define CHROME_TEST_LOGGING_WIN_LOG_FILE_PRINTER_H_
 
 #include <iosfwd>
 
+namespace base {
 class FilePath;
+}
 
 namespace logging_win {
 
 // Reads |log_file|, emitting messages to |out|.  Although it is safe to call
 // this from multiple threads, only one file may be read at a time; other
 // threads trying to read other log files will be blocked waiting.
-void PrintLogFile(const FilePath& log_file, std::ostream* out);
+void PrintLogFile(const base::FilePath& log_file, std::ostream* out);
 
 }  // namespace logging_win
 
 #endif  // CHROME_TEST_LOGGING_WIN_LOG_FILE_PRINTER_H_