Convert Pass()→std::move() in //net

BUG=557422
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Review URL: https://codereview.chromium.org/1545233002

Cr-Commit-Position: refs/heads/master@{#366889}
diff --git a/net/socket/unix_domain_client_socket_posix.cc b/net/socket/unix_domain_client_socket_posix.cc
index 8b15e73..fc2b303 100644
--- a/net/socket/unix_domain_client_socket_posix.cc
+++ b/net/socket/unix_domain_client_socket_posix.cc
@@ -6,6 +6,7 @@
 
 #include <sys/socket.h>
 #include <sys/un.h>
+#include <utility>
 
 #include "base/logging.h"
 #include "base/posix/eintr_wrapper.h"
@@ -23,7 +24,7 @@
 }
 
 UnixDomainClientSocket::UnixDomainClientSocket(scoped_ptr<SocketPosix> socket)
-    : use_abstract_namespace_(false), socket_(socket.Pass()) {}
+    : use_abstract_namespace_(false), socket_(std::move(socket)) {}
 
 UnixDomainClientSocket::~UnixDomainClientSocket() {
   Disconnect();