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gmock's Pointee matcher dereferences raw or smart pointers. It depends
on smart pointers defining element_type to recognize what type they
hold. This patch adds element_type to StructPtr and InlineStructPtr so
gmock will recognize them as smart pointers.

R=rockot

Change-Id: I06333a31c0a958fd24784e1ee2244d0232267bba
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2403583Reviewed-by: Ken Rockot <rockot@google.com>
Commit-Queue: Joe Mason <joenotcharles@chromium.org>
Cr-Commit-Position: refs/heads/master@{#805915}