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According to HTML to platform accessibility mappings 1.1 native text boxes input and textarea, but not content editables, should get an ARIA role of textbox.
I went through all our code in Blink and observed that aria-autocomplete was the only case where we didn't apply the same treatment to ARIA and native text controls.
R=aleventhal@chromium.org, dmazzoni@chromium.org

Bug: 761230
Change-Id: Ie25e0b072b24f1f6ebf6d5b2e317b656fb463fdf
Tested: manually, browser test
Reviewed-on: https://chromium-review.googlesource.com/804915
Commit-Queue: Dominic Mazzoni <dmazzoni@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521358}