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This CL prevents Remote Apps from being pinned when dragging the
launcher item onto the shelf.

Remote Apps already do not have a context menu item for pinning, so this
CL makes Remote Apps unpinnable.

Bug: 1101208
Change-Id: Iaa25530dc84d20cc420a8a407898979ef7a558de
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2382606
Commit-Queue: Jit Yao Yap <jityao@google.com>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#804084}