Roll buildtools fa660d47..ecc8e253

Roll buildtools fa660d47..ecc8e253

https://chromium.googlesource.com/chromium/buildtools/+log/fa660d47..ecc8e253

ecc8e25 Roll GN #330790:#333203 (9d04333f..4e3e57b2)
46ce8cb Optionally support relative include paths in cpp_checker.py
b983eee Fix the .gitignore rules to complain about linux32 if need be.

The GN roll contains the following changes to tools/gn:

  https://chromium.googlesource.com/chromium/src.git/+log/9d04333f..4e3e57b2/tools/gn

  56affab Check for inputs not generated by deps
  e903c0f Allow directories for GN data lists.
  ff0986f GN: Make file/dir resolving return errors.
  b73b2de Add support for module-definition files to gn
  58a1b33 Add base/files/file_tracing.cc to tools/gn/bootstrap/bootstrap.py.
  92acc5e gn: Add a newline to fix a bulleted list in README.md.
  81d969a Fix missing print command in a GN error case.
  a9adafe Make GN header checker more lenient about toolchains.

  In addition, the Linux build of GN was the first build with
  use_ozone=true use_glib=false in order to not have a runtime
  dependency on glib.

TBR=brettw@chromium.org
CQ_EXTRA_TRYBOTS=tryserver.chromium.win:win8_chromium_gn_dbg;tryserver.chromium.mac:mac_chromium_gn_rel,mac_chromium_gn_dbg

Review URL: https://codereview.chromium.org/1168473005

Cr-Commit-Position: refs/heads/master@{#335359}