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A crash in several interactive_ui_tests is seen if the feature flags
WinUseBrowserSpellChecker and kWinDelaySpellcheckServiceInitfeature
are set to be on by default. Fix is just to follow the same pattern
used in other SpellCheckHostChromeImpl methods and do an early
return if the SpellcheckService is null.

Bug: 1118185
Change-Id: I785cd8cec37f42080acedb968b4a6671b01d2378
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2363871
Commit-Queue: Rouslan Solomakhin <rouslan@chromium.org>
Reviewed-by: Rouslan Solomakhin <rouslan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#799562}