Avoid signed/unsigned warning in VC++ 2017 builds
VC++ 2017's STL doesn't suppress warnings as aggressively as prior versions did. This causes warnings on code which mixes signed and unsigned types. In this case a deque of unsigned integers was being queried to see how many signed integers it contains. This could be fixed by passing in unsigned 0, 1, and 2 to std::count but changing the deque from unsigned to int is simpler. R=adamk@chromium.org BUG=chromium:683729 Review-Url: https://codereview.chromium.org/2834293002 Cr-Commit-Position: refs/heads/master@{#44814}
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