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Per discussion at:
https://chromium-review.googlesource.com/c/chromium/src/+/1665909/4

This CL is a preliminary CL for the above CL. This CL moves ItemAdapter
out of the ItemChooserDialog so that it can also be used by
BluetoothScanningPermissionDialog in the above CL.

Bug: 960960
Change-Id: I9e08b7dc43b7de6b8c7ca55c3ed3cf4d1693ead7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1669908
Commit-Queue: Jun Cai <juncai@chromium.org>
Reviewed-by: Ted Choc <tedchoc@chromium.org>
Reviewed-by: Becky Zhou <huayinz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#672236}