Set external/wpt/editing/run/removeformat.html timeout on Linux MSAN

TBR=msramek@chromium.org
NOTRY=true

Bug: 736370
Change-Id: Ifb265e3ed6120b21b3e10ca17188122eed4b0a84
Reviewed-on: https://chromium-review.googlesource.com/545616Reviewed-by: Xida Chen <xidachen@chromium.org>
Reviewed-by: Martin Šrámek <msramek@chromium.org>
Commit-Queue: Xida Chen <xidachen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#481888}

third_party/WebKit/LayoutTests/MSANExpectations

@@ -39,6 +39,8 @@ crbug.com/462190 [ Linux ] inspector-protocol/heap-profiler/heap-snapshot-with-e
 crbug.com/671556 [ Linux ] virtual/mojo-loading/http/tests/security/xssAuditor/report-script-tag-replace-state.html [ Timeout Pass ]
 crbug.com/671556 [ Linux ] virtual/mojo-loading/http/tests/security/xssAuditor/report-script-tag.html [ Timeout Pass ]
 
+crbug.com/736370 [ Linux ] external/wpt/editing/run/removeformat.html [ Timeout ]
+
 # Intentionally failed allocations, via partitionAllocGenericFlags()
 crbug.com/577889 [ Linux ] fast/js/typed-array-allocation-failure.html [ Crash ]