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AutocorrectManager was hard to test because it required a full
InputMethodEngine as a dependency. However, it really only needs two
dependencies: an input context handler to manipulate text, and a
suggestion handler to manipulate the autocorrect range.

Pass in the suggestion handler via the ctor, and grab the input context
handler via IMEBridge*.

Add a few unit tests with mock handlers. In a future patch, we will
add a proper fake input context handler so that it's easy to test
UndoAutocorrect.

* Note that there's an open bug to remove IMEBridge as it is global
state. See crbug.com/1149751.

Bug: b/172969200
Change-Id: Ic9deefb873ee94895846bd91efe608ef10418eb8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2543537
Commit-Queue: Darren Shen <shend@chromium.org>
Reviewed-by: My Nguyen <myy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#828933}