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Finishes the holding space view hierarchy refactor by renaming:
- HoldingSpaceItemViewsContainer --> HoldingSpaceItemViewsSection
- PinnedFilesContainer --> PinnedFilesBubble
- RecentFilesContainer --> RecentFilesBubble

Bug: 1154998
Change-Id: I621a8c76daf142ced35503fe78801dbfd09d4570
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2587611
Commit-Queue: David Black <dmblack@google.com>
Reviewed-by: Toni Baržić <tbarzic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#836301}