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- This is the first step in converting autofill_assistant to a DFM.
- Create a new //chrome/android/features/autofill_assistant:java target
  that includes almost all files that used to be under
  org.chromium.chrome.browser.autofill_assistant.*.
  - Create separate strings and resources targets.
  - Split out instrumentation test code.
  - Add the resulting target to chrome_all_java.
  - Due to a dependency from CustomTabs, this move excludes:
    - AutofillAssistantClient.java
    - AutofillAssistantFacade.java
    - AutofillAssistantMetrics.java
    - AutofillAssistantPreferencesUtil.java

Tbr: Just moving existing DEPS into a new DEPS file
Bug: 846440,922053
Change-Id: I0ee13a75f5f0ce59496e924bcc8e54ef6e960957
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1499720Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Theresa <twellington@chromium.org>
Reviewed-by: Tibor Goldschwendt <tiborg@chromium.org>
Reviewed-by: Ganggui Tang <gogerald@chromium.org>
Commit-Queue: Theresa <twellington@chromium.org>
Auto-Submit: Peter Wen <wnwen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#638357}