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There was an assumption that a single prebuilt would not have more than
64k methods, but the assumption was wrong.

Bug: None
Change-Id: I4a94c383fa47ffd7f6034e094e495e98afe70c68
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2027893
Commit-Queue: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Sky Malice <skym@chromium.org>
Reviewed-by: Sam Maier <smaier@chromium.org>
Cr-Commit-Position: refs/heads/master@{#736561}