Disable flaky audits2-successful-run.js on Linux MSAN

TBR=paulirish@chromium.org

Bug: 798957
Change-Id: Ie27c65a17125e987416ef4aa89ecc9ff03a9d30a
Reviewed-on: https://chromium-review.googlesource.com/850353
Commit-Queue: Xida Chen <xidachen@chromium.org>
Reviewed-by: Dominic Battré <battre@chromium.org>
Cr-Commit-Position: refs/heads/master@{#527001}

third_party/WebKit/LayoutTests/MSANExpectations

@@ -82,3 +82,4 @@ crbug.com/760543 [ Linux ] http/tests/devtools/tracing/timeline-paint/timeline-p
 
 # Timing out consistenly on WebKit Linux Trusty MSAN
 crbug.com/798957 [ Linux ] http/tests/devtools/audits2/audits2-limited-run.js [ Skip ]
+crbug.com/798957 [ Linux ] http/tests/devtools/audits2/audits2-successful-run.js [ Skip ]