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The InstalledAppProviderTest suite uses AsyncTask, which apparently
requires a BrowserTaskEnvironment for the AsyncTask to actually run
(sometimes it runs anyways - I don't know why).

Bug: 1041909
Change-Id: Ida7a8ee8296ce489b560cec00e3b0ca2c4d7d982
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2003751
Commit-Queue: Michael Thiessen <mthiesse@chromium.org>
Reviewed-by: Yaron Friedman <yfriedman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#732227}