Improve process launch handle sharing API.

content/browser/zygote_host/zygote_communication_linux.cc

Index: content/browser/zygote_host/zygote_communication_linux.cc
diff --git a/content/browser/zygote_host/zygote_communication_linux.cc b/content/browser/zygote_host/zygote_communication_linux.cc
index 1c2192cafdc3f56a585bb53d01213623dc91e564..88f24452d81af0f780a97e544858e9d418c3086c 100644
--- a/content/browser/zygote_host/zygote_communication_linux.cc
+++ b/content/browser/zygote_host/zygote_communication_linux.cc
@@ -84,7 +84,7 @@ ssize_t ZygoteCommunication::ReadReply(void* buf, size_t buf_len) {
 
 pid_t ZygoteCommunication::ForkRequest(
     const std::vector<std::string>& argv,
-    std::unique_ptr<FileDescriptorInfo> mapping,
+    std::unique_ptr<PosixFileDescriptorInfo> mapping,
     const std::string& process_type) {
   DCHECK(init_);
 
@@ -111,7 +111,7 @@ pid_t ZygoteCommunication::ForkRequest(
 
   // First FD to send is peer_sock.
   // TODO(morrita): Ideally, this should be part of the mapping so that
-  // FileDescriptorInfo can manages its lifetime.
+  // PosixFileDescriptorInfo can manages its lifetime.
   fds.push_back(peer_sock.get());
 
   // The rest come from mapping.