Tighten up DEPS include rules.

Allows the following command to return only legitimate
warnings:
  buildtools/checkdeps/checkdeps.py --resolve-dotdot

The remaining warnings consist of:
  - fx_parser_filters.cpp, due to inclusion of
    third_party/zlib_v128/zlib.h, showing the lack
    of a header and some prototypes in that .cpp file.

  - third_party/*, due to inclusion of fx_system.h and
    the like, indicating adulterated libraries that should
    be restored to their pristine state.

R=thestig@chromium.org

Review URL: https://codereview.chromium.org/1233583004 .
5 files changed