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This change switches from using testing::CreateFunctor
when calling testing::Invoke() to a C++ lambda. This
improves test readibility and allows for gmock_mutant.h
to be removed in an upcoming CL.

TBR=pinkerton@chromium.org

Bug: 1007833, 806952
Change-Id: Id60006d1fb841ca89f47c20170ee2df4c16e8c2f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1887842Reviewed-by: Chris Mumford <cmumford@google.com>
Commit-Queue: Chris Mumford <cmumford@google.com>
Cr-Commit-Position: refs/heads/master@{#714030}