Remove unsafe int->PrefetchItemState conversion

Bug: 944674
Change-Id: I87b78461583fa90ab5e55cea68aacde5677e8245
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1535193
Commit-Queue: Dan H <harringtond@google.com>
Reviewed-by: Carlos Knippschild <carlosk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#643358}
4 files changed