Replace ScopedVector<ScopedFD> with std::vector<ScopedFD>

sandbox/linux/syscall_broker/broker_host.cc

Index: sandbox/linux/syscall_broker/broker_host.cc
diff --git a/sandbox/linux/syscall_broker/broker_host.cc b/sandbox/linux/syscall_broker/broker_host.cc
index 1a0568fb2f0458ecfd5567544a631808abef8406..068329192710b15a5e04ff291e0e6b5831c9ca28 100644
--- a/sandbox/linux/syscall_broker/broker_host.cc
+++ b/sandbox/linux/syscall_broker/broker_host.cc
@@ -174,7 +174,7 @@ BrokerHost::~BrokerHost() {
 // that we will then close.
 // A request should start with an int that will be used as the command type.
 BrokerHost::RequestStatus BrokerHost::HandleRequest() const {
-  ScopedVector<base::ScopedFD> fds;
+  std::vector<base::ScopedFD> fds;
   char buf[kMaxMessageLength];
   errno = 0;
   const ssize_t msg_len = base::UnixDomainSocket::RecvMsg(
@@ -187,13 +187,12 @@ BrokerHost::RequestStatus BrokerHost::HandleRequest() const {
 
   // The client should send exactly one file descriptor, on which we
   // will write the reply.
-  // TODO(mdempsky): ScopedVector doesn't have 'at()', only 'operator[]'.
-  if (msg_len < 0 || fds.size() != 1 || fds[0]->get() < 0) {
+  if (msg_len < 0 || fds.size() != 1 || fds.at(0).get() < 0) {
     PLOG(ERROR) << "Error reading message from the client";
     return RequestStatus::FAILURE;
   }
 
-  base::ScopedFD temporary_ipc(std::move(*fds[0]));
+  base::ScopedFD temporary_ipc(std::move(fds.at(0)));
 
   base::Pickle pickle(buf, msg_len);
   base::PickleIterator iter(pickle);