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This CL turns on the kIntentHandlingSharing and kSharesheet flags to
enable sharesheet feature by default.

BUG=1097623

Change-Id: Idff4e37934fb730b7f83b86206d555a8c049f12e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2460206
Commit-Queue: Maggie Cai <mxcai@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816071}