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

sync/sync_core.gypi

 # Copyright 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_dirs': [
     '..',
   ],
   'defines': [
     'SYNC_IMPLEMENTATION',
@@ skipping 163 matching lines @@
     'util/data_encryption_win.h',
 
     'util/data_type_histogram.h',
     'util/encryptor.h',
     'util/extensions_activity_monitor.cc',
     'util/extensions_activity_monitor.h',
     'util/get_session_name.cc',
     'util/get_session_name.h',
     'util/get_session_name_ios.mm',
     'util/get_session_name_ios.h',
+    'util/get_session_name_linux.cc',
+    'util/get_session_name_linux.h',
     'util/get_session_name_mac.mm',
     'util/get_session_name_mac.h',
     'util/get_session_name_win.cc',
     'util/get_session_name_win.h',
     'util/logging.cc',
     'util/logging.h',
     'util/nigori.cc',
     'util/nigori.h',
     'util/time.cc',
     'util/time.h',
   ],
 }