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 <hscham@chromium.org>
Commit-Queue: Grace Cham <hscham@chromium.org>
Reviewed-by: Hidehiko Abe <hidehiko@chromium.org>
1 file changed