Refactor Pickle Read methods to use higher performance PickleIterator.

content/common/font_config_ipc_linux.cc

-// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// 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 "content/common/font_config_ipc_linux.h"
 
 #include <errno.h>
 #include <unistd.h>
 #include <fcntl.h>
 #include <sys/socket.h>
 #include <sys/uio.h>
@@ skipping 34 matching lines @@
   request.WriteString(family);
 
   uint8_t reply_buf[512];
   const ssize_t r = UnixDomainSocket::SendRecvMsg(fd_, reply_buf,
                                                   sizeof(reply_buf), NULL,
                                                   request);
   if (r == -1)
     return false;
 
   Pickle reply(reinterpret_cast<char*>(reply_buf), r);
-  void* iter = NULL;
+  PickleIterator iter(reply);
   bool result;
   if (!reply.ReadBool(&iter, &result))
     return false;
   if (!result)
     return false;
 
   uint32_t reply_filefaceid;
   std::string reply_family;
   bool resulting_bold, resulting_italic;
   if (!reply.ReadUInt32(&iter, &reply_filefaceid) ||
@@ skipping 24 matching lines @@
   uint8_t reply_buf[256];
   const ssize_t r = UnixDomainSocket::SendRecvMsg(fd_, reply_buf,
                                                   sizeof(reply_buf),
                                                   &result_fd, request);
 
   if (r == -1)
     return -1;
 
   Pickle reply(reinterpret_cast<char*>(reply_buf), r);
   bool result;
-  void* iter = NULL;
+  PickleIterator iter(reply);
   if (!reply.ReadBool(&iter, &result) ||
       !result) {
     if (result_fd)
       close(result_fd);
     return -1;
   }
 
   return result_fd;
 }