Refactor Pickle Read methods to use higher performance PickleIterator.

ipc/ipc_message.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 IPC_IPC_MESSAGE_H_
 #define IPC_IPC_MESSAGE_H_
 #pragma once
 
 #include <string>
 
@@ skipping 162 matching lines @@
   }
 
 #if defined(OS_POSIX)
   // On POSIX, a message supports reading / writing FileDescriptor objects.
   // This is used to pass a file descriptor to the peer of an IPC channel.
 
   // Add a descriptor to the end of the set. Returns false iff the set is full.
   bool WriteFileDescriptor(const base::FileDescriptor& descriptor);
   // Get a file descriptor from the message. Returns false on error.
   //   iter: a Pickle iterator to the current location in the message.
-  bool ReadFileDescriptor(void** iter, base::FileDescriptor* descriptor) const;
+  bool ReadFileDescriptor(PickleIterator* iter,
+                          base::FileDescriptor* descriptor) const;
 #endif
 
 #ifdef IPC_MESSAGE_LOG_ENABLED
   // Adds the outgoing time from Time::Now() at the end of the message and sets
   // a bit to indicate that it's been added.
   void set_sent_time(int64 time);
   int64 sent_time() const;
 
   void set_received_time(int64 time) const;
   int64 received_time() const { return received_time_; }
@@ skipping 84 matching lines @@
   MSG_ROUTING_NONE = -2,
 
   // indicates a general message not sent to a particular tab.
   MSG_ROUTING_CONTROL = kint32max,
 };
 
 #define IPC_REPLY_ID 0xFFFFFFF0  // Special message id for replies
 #define IPC_LOGGING_ID 0xFFFFFFF1  // Special message id for logging
 
 #endif  // IPC_IPC_MESSAGE_H_