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Since the spellchecker code has been migrated from the FILE
thread to TaskScheduler, tests need to use
content::RunAllTasksUntilIdle() instead of
base::RunLoop().RunUntilIdle() to wait for all spellchecker-related
tasks to run.

Bug: 770653
Change-Id: I8c4ac0e1183d8e11b8d60e334140e1fc1066d787
Reviewed-on: https://chromium-review.googlesource.com/695835Reviewed-by: Rachel Blum <groby@chromium.org>
Commit-Queue: François Doray <fdoray@chromium.org>
Cr-Commit-Position: refs/heads/master@{#506455}