Use the machine hostname on Linux machines for the sync session name rather than

sync/util/get_session_name_linux.cc

+// Copyright (c) 2013 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 "sync/util/get_session_name_linux.h"
+
+#include <limits.h>  // for HOST_NAME_MAX
+#include <unistd.h>  // for gethostname()
+
+#include "base/linux_util.h"
+
+namespace syncer {
+namespace internal {
+
+std::string GetHostname() {
+  char hostname[HOST_NAME_MAX];
+  if (gethostname(hostname, HOST_NAME_MAX) == 0)  // Success.
+    return hostname;
+  return base::GetLinuxDistro();
+}
+
+}  // namespace internal
+}  // namespace syncer
+