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This is a regression in http://crrev.com/c/1053116.
The target widget is used in DetachedTitleAreaRenderer and WideFrameView.

BUG=b/33693796
TEST=covered by unittest

Change-Id: I839d13113a40abde4d25d7e634ad549937dac30b
Reviewed-on: https://chromium-review.googlesource.com/1067319
Commit-Queue: Mitsuru Oshima <oshima@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Reviewed-by: Evan Stade <estade@chromium.org>
Cr-Commit-Position: refs/heads/master@{#561355}