Linux: refactor zygote support

chrome/common/ipc_channel_proxy.cc

Index: chrome/common/ipc_channel_proxy.cc
diff --git a/chrome/common/ipc_channel_proxy.cc b/chrome/common/ipc_channel_proxy.cc
index 6e8919a32622c4fa37a24f2ed143998260feeb03..c77ee7e228b46e3ec1020d040d6cbd57d2f2fdf8 100644
--- a/chrome/common/ipc_channel_proxy.cc
+++ b/chrome/common/ipc_channel_proxy.cc
@@ -289,11 +289,10 @@ void ChannelProxy::RemoveFilter(MessageFilter* filter) {
 // See the TODO regarding lazy initialization of the channel in
 // ChannelProxy::Init().
 // We assume that IPC::Channel::GetClientFileDescriptorMapping() is thread-safe.
-void ChannelProxy::GetClientFileDescriptorMapping(int *src_fd,
-                                                  int *dest_fd) const {
+int ChannelProxy::GetClientFileDescriptor() const {
   Channel *channel = context_.get()->channel_;
   DCHECK(channel); // Channel must have been created first.
-  channel->GetClientFileDescriptorMapping(src_fd, dest_fd);
+  return channel->GetClientFileDescriptor();
 }
 #endif