Roll mesa 457812d9:9731cb9

DEPS

 # This file is automatically processed to create .DEPS.git which is the file
 # that gclient uses under git.
 #
 # See http://code.google.com/p/chromium/wiki/UsingGit
 #
 # To test manually, run:
 #   python tools/deps2git/deps2git.py -o .DEPS.git -w <gclientdir>
 # where <gcliendir> is the absolute path to the directory containing the
 # .gclient file (the parent of 'src').
 #
@@ skipping 266 matching lines @@
   'src/third_party/pywebsocket/src':
     Var('chromium_git') + '/external/pywebsocket/src.git' + '@' + 'cb349e87ddb30ff8d1fa1a89be39cec901f4a29c',
 
   'src/third_party/opus/src':
    Var('chromium_git') + '/chromium/deps/opus.git' + '@' + 'cae696156f1e60006e39821e79a1811ae1933c69',
 
   'src/media/cdm/ppapi/api':
    Var('chromium_git') + '/chromium/cdm.git' + '@' + '41c8183a3966a17b440dbe606cb2840e1b7ce884',
 
   'src/third_party/mesa/src':
-   Var('chromium_git') + '/chromium/deps/mesa.git' + '@' + '457812d99a213dedf1c4cd38018ff48118d0c44f',
+   Var('chromium_git') + '/chromium/deps/mesa.git' + '@' + '9731cb962963bca8a05f3d0f6ea40c3a781f0537',
 
   'src/third_party/cld_2/src':
     Var('chromium_git') + '/external/cld2.git' + '@' + 'bb5c092e8c02dcc2319c5056aff2182199d51c2f',
 
   'src/chrome/browser/resources/pdf/html_office':
     Var('chromium_git') + '/chromium/html-office-public.git' + '@' + 'eeff97614f65e0578529490d44d412032c3d7359',
 
   'src/third_party/libwebm/source':
    Var('chromium_git') + '/webm/libwebm.git' + '@' + '0d4cb404ea4195e5e21d04db2c955615535ce62e',
 
@@ skipping 493 matching lines @@
     # corresponding .py files have already been deleted.
     'name': 'remove_stale_pyc_files',
     'pattern': 'src/tools/.*\\.py',
     'action': [
         'python',
         'src/tools/remove_stale_pyc_files.py',
         'src/tools',
     ],
   },
 ]