libweave: remove base::size The function will be moved from base/stl_util.h to base/cxx17_backports.h after libchrome r885290, and no longer be indirectly included via the former after r900305 uprev. Use range based for loops instead. BUG=b:198993705 TEST=FEATURES=test emerge-hatch libweave Change-Id: I7a8922d1ee75e7a4d5f47c84d3a5a7c4723790bf Reviewed-on: https://chromium-review.googlesource.com/c/weave/libweave/+/3304905 Tested-by: Grace Cham <[email protected]> Commit-Queue: Grace Cham <[email protected]> Reviewed-by: Hidehiko Abe <[email protected]>