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git cl lint wants the WeakPtrFactory to be the last element in the class.
However, DISALLOW_COPY_AND_ASSIGN is also supposed to be last.  To fix
this, remove the use of the macro.

Bug: None
Change-Id: Id617ab238d1a7929017fe8c28be2689e4d3df404
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1937137
Commit-Queue: Sean Kau <skau@chromium.org>
Commit-Queue: Luum Habtemariam <luum@chromium.org>
Auto-Submit: Sean Kau <skau@chromium.org>
Reviewed-by: Luum Habtemariam <luum@chromium.org>
Cr-Commit-Position: refs/heads/master@{#719247}