Use cpplint.py from repohooks

The cpplint.py in external/google-styleguide is out of date and doesn't
support python 3.  Switch to the one in tools/repohooks/tools to match
the preupload configuration.  Also fix some lint issues caught by the
new version.

Test: m cpplint-art
Change-Id: Ie8c307388362c03c6f33cda6d4ec95c244481adf
6 files changed