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This patch removes |DCHECK(current_drag_data_.IsNull())| to avoid crash when
test scripts don't finish mouse drag, e.g. not to call |eventSender.mouseUp()|
because of assertion failure in w3c test scripts for ease of writing
test scripts.

This patch is suggested in another CL[1].

[1] http://crrev.com/c/2148920 Make editing/selection/drag-in-iframe.html not to
crash

Bug: 707656
Change-Id: I989c1fe8cceb39566e3f8ddda364b4dc9cc060aa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2150346
Commit-Queue: Yoshifumi Inoue <yosin@chromium.org>
Commit-Queue: Kent Tamura <tkent@chromium.org>
Reviewed-by: Kent Tamura <tkent@chromium.org>
Auto-Submit: Yoshifumi Inoue <yosin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#759193}