Move PathExists to base namespace.

ipc/ipc_channel_posix.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 "ipc/ipc_channel_posix.h"
 
 #include <errno.h>
 #include <fcntl.h>
 #include <stddef.h>
 #include <sys/socket.h>
@@ skipping 562 matching lines @@
     delete m;
   }
 
   // Close any outstanding, received file descriptors.
   ClearInputFDs();
 }
 
 // static
 bool Channel::ChannelImpl::IsNamedServerInitialized(
     const std::string& channel_id) {
-  return file_util::PathExists(base::FilePath(channel_id));
+  return base::PathExists(base::FilePath(channel_id));
 }
 
 #if defined(OS_LINUX)
 // static
 void Channel::ChannelImpl::SetGlobalPid(int pid) {
   global_pid_ = pid;
 }
 #endif  // OS_LINUX
 
 // Called by libevent when we can read from the pipe without blocking.
@@ skipping 425 matching lines @@
 
 
 #if defined(OS_LINUX)
 // static
 void Channel::SetGlobalPid(int pid) {
   ChannelImpl::SetGlobalPid(pid);
 }
 #endif  // OS_LINUX
 
 }  // namespace IPC