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Avoid risky casts between void* and object pointers
by using the wincx method on the
CryptoModuleBlockingPasswordDelegate. While safety
was assured by virtue of being passed as a
scoped_refptr<> to the appropriate base class,
consistently use the wincx() method of the password
delegate so that safety can be reasoned about from
the callsite, rather than inferred from the type.

BUG=none

Change-Id: I120584dd5a62d1533689871f4a207f7205c6ada7
Reviewed-on: https://chromium-review.googlesource.com/c/1309097Reviewed-by: David Benjamin <davidben@chromium.org>
Commit-Queue: Ryan Sleevi <rsleevi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#604091}