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Some users have a huge amount of bookmarks (>100K) and ordered STL
containers can run into performance issues.

To reduce UI jank during browser startup, let's trivially adopt
unordered containers. This can help reduce the time spent in
SyncedBookmarkTracker::InitEntitiesFromModelAndMetadata().

Change-Id: Id789a1d8f0aa14a94aa0974b939568b966be6300
Bug: 1068378
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2306253
Auto-Submit: Mikel Astiz <mastiz@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Commit-Queue: Mikel Astiz <mastiz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#789917}