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AutofillController for the most part forwards calls from AutofillClient
and AutofillDriver to AutofillAgent. This complicates understanding and
debugging the logic. It also has some logic (e.g., adding clear form and
gpay logo to the list of suggestions) that has been a source of confusion
in past. This CL gets rid of AutofillController by:
-Removing the middle man for the AutofillClient and AutofillDriver calls.
-Moving the logic to setup AutofillDriver to AutofillTabHelper.
-Merging its tests into AutofillAgent and JSAutofillManager tests.

Change-Id: I207ec8137a8d4b0cfc1c42de8cd06b8f4de33e67
Reviewed-on: https://chromium-review.googlesource.com/c/1310353
Commit-Queue: Moe Ahmadi <mahmadi@chromium.org>
Reviewed-by: Olivier Robin <olivierrobin@chromium.org>
Reviewed-by: Sergio Collazos <sczs@chromium.org>
Reviewed-by: John Wu <jzw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#611967}