Convert an OS_SUN use to OS_SOLARIS.

PRESUBMIT.py

 # Copyright (c) 2012 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.
 
 """Top-level presubmit script for Chromium.
 
 See http://dev.chromium.org/developers/how-tos/depottools/presubmit-scripts
 for more details about the presubmit API built into gcl.
 """
 
@@ skipping 161 matching lines @@
     'OS_CAT',       # For testing.
     'OS_CHROMEOS',
     'OS_FREEBSD',
     'OS_IOS',
     'OS_LINUX',
     'OS_MACOSX',
     'OS_NACL',
     'OS_OPENBSD',
     'OS_POSIX',
     'OS_SOLARIS',
-    'OS_SUN',       # Not in build/build_config.h but in skia.
     'OS_WIN',
 )
 
 
 def _CheckNoProductionCodeUsingTestOnlyFunctions(input_api, output_api):
   """Attempts to prevent use of functions intended only for testing in
   non-testing code. For now this is just a best-effort implementation
   that ignores header files and may have some false positives. A
   better implementation would probably need a proper C++ parser.
   """
@@ skipping 726 matching lines @@
       'win_rel',
       'win:compile',
   ]
 
   # Match things like path/aura/file.cc and path/file_aura.cc.
   # Same for chromeos.
   if any(re.search('[/_](aura|chromeos)', f) for f in files):
     trybots += ['linux_chromeos_clang:compile', 'linux_chromeos_asan']
 
   return trybots