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This CL is adding a sanity dcheck to avoid tests crashing on MAC only when
a chrome developer forgot to call the base function
"ContentBrowserTest::PreRunTestOnMainThread".


  class MyBrowserTest : public ContentBrowserTest {

   public:

    void PreRunTestOnMainThread() override {

      [...]

      ContentBrowserTest::PreRunTestOnMainThread();
  // Required, otherwise crash on MAC.
    }

I recently did that silly mistake and needed time to set up a MAC build to
debug it. I believe this test is cheap enough and worth saving developers time.

R=sky@chromium.org

Change-Id: Iec0ed2e19b216a35c675016ad6ff88dc9e1c86ad
Reviewed-on: https://chromium-review.googlesource.com/c/1407110Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Etienne Bergeron <etienneb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#626186}