Makes test_launcher stop on failure if gtest_break_on_failure is set
Makes test_launcher stop on failure if gtest_break_on_failure is set

This is useful if both a repeat count and break on failure is
set.

BUG=none
TEST=none
R=phajdan.jr@chromium.org

Review URL: https://codereview.chromium.org/1376233002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#351819}

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