Remove yasm (and DONT_EMBED_BUILD_METADATA).

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 64 matching lines @@
     Var('dart_observatory_packages_revision'),
 
   'src/dart/third_party/root_certificates':
     Var('chromium_git') +
     '/external/github.com/dart-lang/root_certificates' + '@' +
     Var('dart_root_certificates_revision'),
 
   'src/third_party/skia':
    Var('chromium_git') + '/skia.git' + '@' +  Var('skia_revision'),
 
-  'src/third_party/yasm/source/patched-yasm':
-   Var('chromium_git') + '/chromium/deps/yasm/patched-yasm.git' + '@' + '4671120cd8558ce62ee8672ebf3eb6f5216f909b',
-
   'src/third_party/smhasher/src':
     Var('chromium_git') + '/external/smhasher.git' + '@' + 'e87738e57558e0ec472b2fc3a643b838e5b6e88f',
 
   'src/third_party/pywebsocket/src':
     Var('chromium_git') + '/external/pywebsocket/src.git' + '@' + 'cb349e87ddb30ff8d1fa1a89be39cec901f4a29c',
 
   'src/third_party/mesa/src':
    Var('chromium_git') + '/chromium/deps/mesa.git' + '@' + '071d25db04c23821a12a8b260ab9d96a097402f0',
 
   'src/third_party/pdfium':
@@ skipping 315 matching lines @@
     'action': [ 'src/tools/download_from_google_storage.py',
                 '--no_resume',
                 '--quiet',
                 '--platform=darwin',
                 '--no_auth',
                 '--bucket', 'mojo/mojom_parser/mac64',
                 '-s', 'src/mojo/public/tools/bindings/mojom_parser/bin/mac64/mojom_parser.sha1',
     ],
   },
 ]