Android: Update proguard to 6.0.3.

This is a reland of df22b81425e5487282a2569f9fd274300a43e3e5.

The CL now forwards proguard_jar_path properly.

Original change's description:
> Use proguard version 6.0.3 for monochrome_public_apk.
>
> MonochromePublic.apk release builds are very close to the main dex limit
> and updating proguard reduces the number of methods by about 3000.
>
> 6.0.3 cannot be used for all APKs yet due to a bug which causes
> cronet_test_instrumentation_apk to fail.
>
> The version mismatch should be temporary as we plan to switch to R8 in the
> future (https://crbug.com/868770).
>
> Bug: 857572
> Cq-Include-Trybots: master.tryserver.chromium.android:android_cronet_tester
> Change-Id: I3676a42908c5046dc3f3831e282150702038140d
> Reviewed-on: https://chromium-review.googlesource.com/1154366
> Reviewed-by: Yaron Friedman <yfriedman@chromium.org>
> Commit-Queue: Eric Stevenson <estevenson@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#579250}

Bug: 857572
Cq-Include-Trybots: master.tryserver.chromium.android:android_cronet_tester;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: Ia52b36e04623c5b72e668bb6c07be018ac9210b5
Reviewed-on: https://chromium-review.googlesource.com/1156004
Reviewed-by: David Turner <digit@chromium.org>
Reviewed-by: Yaron Friedman <yfriedman@chromium.org>
Commit-Queue: Eric Stevenson <estevenson@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#579728}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 4cdc1153e6f6a1182aec5fe42c072db5241b4c3f
2 files changed
tree: 79106771538a0212b4e7976e348bce7cb1b5b094
  1. lib/
  2. BUILD.gn
  3. LICENSE
  4. OWNERS
  5. README.chromium