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This CL refactors the title preview feature in the sharesheet
by moving it into a dedicated SharesheetContentPreviews class.

Bug: 1167935
Change-Id: I2671c0e53e04779e8fe8bdf3d37d30f91161d3a8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2636734Reviewed-by: Melissa Zhang <melzhang@chromium.org>
Reviewed-by: Maggie Cai <mxcai@chromium.org>
Commit-Queue: Angela Gyi <angelagyi@google.com>
Cr-Commit-Position: refs/heads/master@{#845512}