posix: clean up shared memory code

base/shared_memory.h

 // Copyright (c) 2006-2008 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 BASE_SHARED_MEMORY_H_
 #define BASE_SHARED_MEMORY_H_
 
 #include "build/build_config.h"
 
 #if defined(OS_POSIX)
 #include <sys/types.h>
 #include <semaphore.h>
 #include "base/file_descriptor_posix.h"
 #endif
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/process.h"
 
+class FilePath;
+
 namespace base {
 
 // SharedMemoryHandle is a platform specific type which represents
 // the underlying OS handle to a shared memory segment.
 #if defined(OS_WIN)
 typedef HANDLE SharedMemoryHandle;
 typedef HANDLE SharedMemoryLock;
 #elif defined(OS_POSIX)
 // A SharedMemoryId is sufficient to identify a given shared memory segment on a
 // system, but insufficient to map it.
@@ skipping 123 matching lines @@
   // (futex, lockf+anon_semaphore) but none are both clean and common
   // across Mac and Linux.
   void Lock();
 
   // Release the shared memory lock.
   void Unlock();
 
  private:
 #if defined(OS_POSIX)
   bool CreateOrOpen(const std::wstring &name, int posix_flags, size_t size);
-  bool FilenameForMemoryName(const std::wstring &memname,
-                             std::wstring *filename);
+  bool FilePathForMemoryName(const std::wstring& memname, FilePath* path);
   void LockOrUnlockCommon(int function);
 
 #endif
   bool ShareToProcessCommon(ProcessHandle process,
                             SharedMemoryHandle* new_handle,
                             bool close_self);
 
 #if defined(OS_WIN)
   std::wstring       name_;
   HANDLE             mapped_file_;
@@ skipping 25 matching lines @@
   }
 
  private:
   SharedMemory* shared_memory_;
   DISALLOW_EVIL_CONSTRUCTORS(SharedMemoryAutoLock);
 };
 
 }  // namespace base
 
 #endif  // BASE_SHARED_MEMORY_H_