Change most uses of Pickle to base::Pickle

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 883 matching lines @@
     }
 
     default:
       NOTREACHED();
       break;
   }
 }
 
 void ChannelPosix::HandleInternalMessage(const Message& msg) {
   // The Hello message contains only the process id.
-  PickleIterator iter(msg);
+  base::PickleIterator iter(msg);
 
   switch (msg.type()) {
     default:
       NOTREACHED();
       break;
 
     case Channel::HELLO_MESSAGE_TYPE:
       int pid;
       if (!iter.ReadInt(&pid))
         NOTREACHED();
@@ skipping 103 matching lines @@
 }
 
 #if defined(OS_LINUX)
 // static
 void Channel::SetGlobalPid(int pid) {
   ChannelPosix::SetGlobalPid(pid);
 }
 #endif  // OS_LINUX
 
 }  // namespace IPC