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In preparation for the full launch of the Windows native spell checker
integration, this change enables the WinUseBrowserSpellChecker feature
by default.

Also fixes a few tests that were making assumptions about the code path
that was used inside the spellcheck provider, which no longer hold true
when the native spell checker integration is enabled by default.

Bug: 978460
Change-Id: I0cac4a5ab8384c03485fb827308e40598f0828b3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2413038Reviewed-by: Rouslan Solomakhin <rouslan@chromium.org>
Commit-Queue: Guillaume Jenkins <gujen@google.com>
Cr-Commit-Position: refs/heads/master@{#807906}