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The browser process sends the system spellchecker language to the
renderer to initialize its text breaker. The text breaker is used when
providing suggestions in the context menu. If the text breaker is not
initialized, the menu has no suggestions.

The browser saves the system spellchecker language into the unsynced
preference prefs::kSpellCheckDictionaries. This preference is also used
by the spelling service client. If the preference is empty, then the
client is disabled.

BUG=577835

Review URL: https://codereview.chromium.org/1602303002

Cr-Commit-Position: refs/heads/master@{#371605}