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This is the major change for autofill automation EG2 migration.

- Separated test and app side code in former automation_egtest.mm by
creating private helper function and app interface for app side calls.
|NSString*| and |NSError*| are communicated between test and app. App
interface code is mostly migrated from automation_egtest.mm with minor
changes:
  - |GREYAssert|s are changed to |NSError*| to be sent back to test.
  - Moved some instance variable and methods to static variable and
  functions.

- Overrode |launchAppForTestMethod| in |AutofillAutomationTestCase| to
start app with needed features.

- Created eg2test target and eg_app_support+eg2 target in automation
BUILD.gn. Created new eg2tests_module and included new eg2test target
in earlgrey2 BUILD.gn.

- Removed unused headers in code and unused deps from build file.


Bug: 987646, 1003605
Change-Id: I22ae675848bd1b08df9cdb375a6dcfb2f42b8c75
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1850739
Commit-Queue: Zhaoyang Li <zhaoyangli@chromium.org>
Reviewed-by: Dominic Battré <battre@chromium.org>
Reviewed-by: Olivier Robin <olivierrobin@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#706954}