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This is a reland of crrev.com/c/1894296

The commit was reverted in crrev.com/c/1971041 because the new browser
tests failed when run by the |linux-chromeos-chrome| trybot.

The tests failed because the |fake_s3_server_main| binary was not copied
over to the sandboxes used by the |linux-chromeos-chrome| trybot while
it runs its tests.

This is fixed by adding the |fake_s3_server_main| as a runtime dependency
of the |browser_unittests| build target.

Original change's description:
> Add Assistant integration tests using a fake S3 server.
>
> These tests run as browser tests, use the real libassistant code and use a fake
> s3 server to replay previously recorded conversations.
>
> This allows the Assistant to run CQ tests that verify the basic interactions
> are not broken.
>
> More specifically, this uses a FakeS3Server library that was previously
> created by the LibAssistant team. On the ChromeOS side I added hooks to
> tell LibAssistant to use the FakeS3Server, and a test-fixture to start/stop
> the fake S3 server during the browsertests.
>
> BUG: b/141264108
> TESTS: in target |browser_tests| with names |AssistantBrowserTest.*|
>
> Change-Id: I89985c9e34eaa21a17eef69fa5b472fa39486d30
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1894296
> Reviewed-by: Sam McNally <sammc@chromium.org>
> Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
> Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
> Commit-Queue: Jeroen Dhollander <jeroendh@google.com>
> Cr-Commit-Position: refs/heads/master@{#725214}

TBR=xiyuan@chromium.org,sammc@chromium.org, xiaohuic@chromium.org
TBRing reviewers:
   - Note There were no changes in any file since crrev.com/c/1894296 except |chrome/test/BUILD.gn|
   - xiyuan@ please look at assistant_test_api.h
   - sammc@ please look at assistant.mojom
   - xiaohuic@ please look at the assistant code

Change-Id: I514daac006c1254db26adf8b0fd3f6be652f4581
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1971225Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Jeroen Dhollander <jeroendh@google.com>
Cr-Commit-Position: refs/heads/master@{#725999}