Linux: use internal copy of libjpeg by default with mangled symbol names.

third_party/libjpeg/libjpeg.gyp

 # Copyright (c) 2009 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.
 
 {
   'variables': {
     'conditions': [
-      [ 'OS=="linux" or OS=="freebsd" or OS=="openbsd"', {
+      ['chromeos==1 or OS=="freebsd" or OS=="openbsd"', {
         # Link to system .so since we already use it due to GTK.
+        # See crbug.com/30288 and 31427 for why we skip OS=="linux" above.
         'use_system_libjpeg%': 1,
-      }, {  # OS!="linux" and OS!="freebsd" and OS!="openbsd"
+      }, {  # chromeos!=1 and OS!="freebsd" and OS!="openbsd"
         'use_system_libjpeg%': 0,
       }],
     ],
   },
   'conditions': [
     ['use_system_libjpeg==0', {
       'targets': [
         {
           'target_name': 'libjpeg',
           'type': '<(library)',
@@ skipping 83 matching lines @@
       ],
     }],
   ],
 }
 
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