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These tests use GoogleTest assertions without using GoogleTest's testing
framework. Since UnitTest::Run() and friends (via RUN_ALL_TESTS) aren't
used to run the tests, Google Test's stack trace getter's
UponLeavingGTest method isn't called prior to running the actual test
code. Upon assertion failure, there is no basis on which to trim the
failure's stack trace.

This CL adds a single call to UponLeavingGTest in LLVMFuzzerTestOneInput
to provide such a basis. Better alternatives are to either run the tests
via RUN_ALL_TESTS (after calling testing::InitGoogleTest) or not use
GoogleTest assertions out of context.

BUG=1039559

Change-Id: I3aa5fa5a36361450548403babddb337af41d25d5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2089845Reviewed-by: Xiaohan Wang <xhwang@chromium.org>
Reviewed-by: Victor Costan <pwnall@chromium.org>
Commit-Queue: Victor Costan <pwnall@chromium.org>
Auto-Submit: Greg Thompson <grt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#747882}