browser_side_navigation_browser_tests failing on chromium.mac/Mac10.11 Tests

Builders failed on: 
- Mac10.11 Tests: 
  https://build.chromium.org/p/chromium.mac/builders/Mac10.11%20Tests


This issue seems to be rarely reoccuring for (at least)
WebNavigationApiTest.CrossProcessHistory. The first visible occurrence 
is https://uberchromegw.corp.google.com/i/chromium.mac/builders/Mac10.11%20Tests/builds/11283