message: DEPS: update toolchain files to not require GYP
  build/vs_toolchain.py used to require GYP that we don't have, update it
  past a commit that removes that requirement.
diff: @@ -9,21 +9,21 @@ vars = {
  deps = {
  # Dependencies required to use GN/Clang in standalone
  '{dawn_root}/build': {
  - 'url': '{chromium_git}/chromium/src/build.git@b944b99e72923c5a6699235ed858e725db21f81f',
  + 'url': '{chromium_git}/chromium/src/build.git@ddcfe1a1c6428569cb8c900735be3567358bc6ee',
  'condition': 'dawn_standalone',
  },
  '{dawn_root}/buildtools': {
  - 'url': '{chromium_git}/chromium/buildtools.git@94288c26d2ffe3aec9848c147839afee597acefd',
  + 'url': '{chromium_git}/chromium/buildtools.git@9a90d9aaadeb5e04327ed05775f45132e4b3523f',
  'condition': 'dawn_standalone',
  },
  '{dawn_root}/tools/clang': {
  - 'url': '{chromium_git}/chromium/src/tools/clang.git@c893c7eec4706f8c7fc244ee254b1dadd8f8d158',
  + 'url': '{chromium_git}/chromium/src/tools/clang.git@d299f069f8d1dca337354ced634df7a78e4512f7',
  'condition': 'dawn_standalone',
  },
  # Testing, GTest and GMock
  '{dawn_root}/testing': {
  - 'url': '{chromium_git}/chromium/src/testing@4d706fd80be9e8989aec5235540e7b46d0672826',
  + 'url': '{chromium_git}/chromium/src/testing@b07830f6905ce9e33034ad14820bc0a58b6e9e41',
  'condition': 'dawn_standalone',
  },
  '{dawn_root}/third_party/googletest': {
  