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Fix a bunch of autocorrect issues

This commit fixes a bunch of autocorrect issues on the Blink side:

* Make undo work properly for autocorrect:
  - Use SpellingCorrectionCommand instead of manually replacing frame contents.
  - Set the selection before applying SpellingCorrectionCommand to include the
    space after the misspelled word.
  - Perform autocorrect after finishing applying the typing command.
* Only perform autocorrect when inserting text (i.e. don't autocorrect when
  we're backspacing and just happen to be at a word boundary).
* Fix the range where spellcheck is done to be only a single word (previously,
  it would check two words when on a boundary).