Fix Chromium build
Fix Chromium build

- We can't build src/base/test/utils.cc on Windows currently so put
  utils.cc/utils.h behind the !is_win flag.
- Fix the standalone MacOS build by inlining the otherwise unused
  kMaxPath.

Bug: crbug.com/872754
Change-Id: I6a15c6df8aa76b996a5ae8236870ce26a0eecd16
google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto