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The current size (32dp) is too small and results in blurry shelf
icons.

Bug: 908968
Test: manual
Change-Id: I86303b66ff433995d12389c371dd5cf24eaf6515
Reviewed-on: https://chromium-review.googlesource.com/c/1352770
Commit-Queue: Vladislav Kaznacheev <kaznacheev@chromium.org>
Reviewed-by: Yury Khmel <khmel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#612722}