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GetResultAs returns a pointer to the transfer buffer. Under some
conditions, the transfer buffer may be reallocated, so we need to make
sure a GetResultAs-returned pointer isn't used across such a
reallocation.

Bug: 905336
Change-Id: I1a9699d38149c56ee5430bff125a1168ca053696
Reviewed-on: https://chromium-review.googlesource.com/c/1336152
Commit-Queue: Antoine Labour <piman@chromium.org>
Reviewed-by: James Darpinian <jdarpinian@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#608145}