Merge most chrome test apks

chrome_public_test_apk is now the union of:
* chrome_public_apk_for_test
* chrome_public_test_apk
* chrome_sync_shell_apk
* chrome_sync_shell_test_apk

Motivation is to simplify the targets, as well as to work around
multidex restrictions.

This change disabled two tests because fixing wasn't trivial:
* FirstRunIntegrationTest.java
* FirstRunTest.java
https://crbug.com/902774 will track un-@Disable'ing them.


NOTRY=true  # linux bot flakiness
TBR=agrieve  # Trivial rename in a couple files.

Bug: 833545, 841628, 901488
Change-Id: I9ebe035e86f1b6e5a208e36040baf038efa6cc15
Reviewed-on: https://chromium-review.googlesource.com/c/1319335
Commit-Queue: agrieve <agrieve@chromium.org>
Reviewed-by: agrieve <agrieve@chromium.org>
Reviewed-by: John Budorick <jbudorick@chromium.org>
Reviewed-by: Eric Stevenson <estevenson@chromium.org>
Reviewed-by: Yaron Friedman <yfriedman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#606283}
46 files changed