Fixing gcc 4.7 building problems.

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/types.h>
 #include <sys/socket.h>
 #include <sys/stat.h>
 #include <sys/un.h>
+#include <unistd.h>
 
 #if defined(OS_OPENBSD)
 #include <sys/uio.h>
 #endif
 
 #include <string>
 #include <map>
 
 #include "base/command_line.h"
 #include "base/eintr_wrapper.h"
@@ skipping 867 matching lines @@
 
 Channel::ChannelImpl::ReadState Channel::ChannelImpl::ReadData(
     char* buffer,
     int buffer_len,
     int* bytes_read) {
   if (pipe_ == -1)
     return READ_FAILED;
 
   struct msghdr msg = {0};
 
-  struct iovec iov = {buffer, buffer_len};
+  struct iovec iov = {buffer, static_cast<size_t>(buffer_len)};
   msg.msg_iov = &iov;
   msg.msg_iovlen = 1;
 
   msg.msg_control = input_cmsg_buf_;
 
   // recvmsg() returns 0 if the connection has closed or EAGAIN if no data
   // is waiting on the pipe.
 #if defined(IPC_USES_READWRITE)
   if (fd_pipe_ >= 0) {
     *bytes_read = HANDLE_EINTR(read(pipe_, buffer, buffer_len));
@@ skipping 273 matching lines @@
 
 
 #if defined(OS_LINUX)
 // static
 void Channel::SetGlobalPid(int pid) {
   ChannelImpl::SetGlobalPid(pid);
 }
 #endif  // OS_LINUX
 
 }  // namespace IPC