Added new stack trace unit tests for breakpad symbol file cases.
Added new stack trace unit tests for breakpad symbol file cases.

R=nednguyen@google.com
BUG=561447

Review URL: https://codereview.chromium.org/1857363002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#385600}

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