Add FilePath to base namespace.

rlz/lib/recursive_cross_process_lock_posix.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.
 
 #ifndef RLZ_LIB_RECURSIVE_CROSS_PROCESS_LOCK_POSIX_H_
 #define RLZ_LIB_RECURSIVE_CROSS_PROCESS_LOCK_POSIX_H_
 
 #include <pthread.h>
 
+namespace base {
 class FilePath;
+}
 
 namespace rlz_lib {
 
 // Creating a recursive cross-process mutex on Windows is one line. On POSIX,
 // there's no primitive for that, so this lock is emulated by an in-process
 // mutex to get the recursive part, followed by a cross-process lock for the
 // cross-process part.
 // This is a struct so that it doesn't need a static initializer.
 struct RecursiveCrossProcessLock {
   // Tries to acquire a recursive cross-process lock. Note that this _always_
   // acquires the in-process lock (if it wasn't already acquired). The parent
   // directory of |lock_file| must exist.
-  bool TryGetCrossProcessLock(const FilePath& lock_filename);
+  bool TryGetCrossProcessLock(const base::FilePath& lock_filename);
 
   // Releases the lock. Should always be called, even if
   // TryGetCrossProcessLock() returned |false|.
   void ReleaseLock();
 
   pthread_mutex_t recursive_lock_;
   pthread_t locking_thread_;
 
   int file_lock_;
 };
 
 // On Mac, PTHREAD_RECURSIVE_MUTEX_INITIALIZER doesn't exist before 10.7 and
 // is buggy on 10.7 (http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51906#c34),
 // so emulate recursive locking with a normal non-recursive mutex.
 #define RECURSIVE_CROSS_PROCESS_LOCK_INITIALIZER    \
   { PTHREAD_MUTEX_INITIALIZER, 0, -1 }
 
 }  // namespace rlz_lib
 
 #endif  // RLZ_LIB_RECURSIVE_CROSS_PROCESS_LOCK_POSIX_H_