Roll buildtools 68e3c238a5..fee7f1e849

  In order to roll GN e33d066..763cd40 (r364398:r365683) and pick up
  the following changes:

  484f322 Add owners file to GN bootstrap.
  b0b2a7f [Tracing Clock Sync] Add TracingAgent interface in Chrome
  98ec25a GN: Makes GN output deterministic
  4514a79 tools/gn: do not break bootstrap process on Windows
  8c8cc28 tools/gn: depend on malloc_dump_provider.cc to keep bootstrap working
  567cb68 Make GN public configs apply libs to targets.

TBR=dpranke@chromium.org
CQ_EXTRA_TRYBOTS=tryserver.chromium.mac:mac_chromium_gn_dbg;tryserver.chromium.win:win8_chromium_gn_dbg,win_chromium_gn_x64_rel

Review URL: https://codereview.chromium.org/1535613002

Cr-Commit-Position: refs/heads/master@{#365797}

DEPS

@@ -55,7 +55,7 @@ vars = {
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling build tools
   # and whatever else without interference from each other.
-  'buildtools_revision': '68e3c238a5ab347436762cb929316aa55ca72563',
+  'buildtools_revision': 'fee7f1e849f59c3fd7bb7b2cacf876edca0572f3',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling PDFium
   # and whatever else without interference from each other.