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This CL replaces the use of std::unordered_map of std containers
with WTF::HashMap in indexeddb/*.

Bug: 952716
Change-Id: Ic56b442d83f41a141a06002ef050ed35177e798e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1692385Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Miyoung Shin <myid.shin@igalia.com>
Cr-Commit-Position: refs/heads/master@{#675597}