ios_chrome_unittests (iPhone 5s iOS 9.3.2) on iOS-9.3.2 failing on internal.bling.main/iphone9-device-x64

Type: build-failure

Builders failed on: 
- iphone9-device-x64: 
  http://master7.golo.chromium.org/i/internal.bling.main/builders/iphone9-device-x64

Looks like the following test failed flakily:

[ RUN      ] TabModelTest.PersistSelectionChange
../../ios/chrome/browser/tabs/tab_model_unittest.mm:887: Failure
Value of: [[NSFileManager defaultManager] removeItemAtPath:stashPath error:nullptr]
  Actual: false
Expected: true
[  FAILED  ] TabModelTest.PersistSelectionChange (54 ms)