unit_tests failing on 4 builders

C  128.568s Main  [CRASH] OfflinePageUtilsTest.CheckExistenceOfPagesWithURL:
C  128.568s Main  [ RUN      ] OfflinePageUtilsTest.CheckExistenceOfPagesWithURL
C  128.568s Main  [FATAL:render_process_host_impl.cc(2471)] Check failed: ::content::BrowserThread::CurrentlyOn(BrowserThread::UI). Must be called on Chrome_UIThread; actually called on Unknown Thread.

Type: build-failure

Builders failed on: 
https://build.chromium.org/p/chromium.linux/builders/Android%20Tests%20(dbg)
- KitKat Tablet Tester: 
  https://build.chromium.org/p/chromium.android/builders/KitKat%20Tablet%20Tester
- Lollipop Phone Tester: 
  https://build.chromium.org/p/chromium.android/builders/Lollipop%20Phone%20Tester
- Lollipop Tablet Tester: 
  https://build.chromium.org/p/chromium.android/builders/Lollipop%20Tablet%20Tester
- Marshmallow Tablet Tester: 
  https://build.chromium.org/p/chromium.android/builders/Marshmallow%20Tablet%20Tester

First failing build:
https://build.chromium.org/p/chromium.linux/builders/Android%20Tests%20%28dbg%29/builds/36575

No obvious causes.  Tried reverting what I thought could cause it locally and couldn't fix this.  Assigning to offline folks.