[zip] Use ZipReader::Next()

Use ZipReader::Next() instead of HasMore(), OpenCurrentEntryInZip(),
etc.

BUG=chromium:1295127
TEST=autoninja -C out/Default unit_tests && out/Default/unit_tests --gtest_filter=ImageWriterOperationTest.ExtractZipFile

Change-Id: Ie863c41a7c270efb1131201a4de7c5529cea35bb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3454404
Reviewed-by: Tetsui Ohkubo <tetsui@chromium.org>
Reviewed-by: Noel Gordon <noel@chromium.org>
Reviewed-by: Ben Wells <benwells@chromium.org>
Commit-Queue: François Degros <fdegros@chromium.org>
Cr-Commit-Position: refs/heads/main@{#971729}