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This reverts commit 339e6581.

Reason for revert: *Probably* broke Android Cast builders.

Original change's description:
> Android: Updates to warnings-as-errors when building
> 
> * Delete java_warnings_as_errors
> * Use treat_warnings_as_errors for android rules
>   * warnings-as-errors is now default true for debug builds
> * Add --warnings-as-errors to proguard.py, dex.py, bytecode_processor.py
>   so that these warnings can all be turned off locally.
> * Made build_utils.CheckOutput fail by default when stderr or stdout is
>   printed. This should prevent build logs from creaping in.
> * Added "you should use treat_warnings_as_errors=false" into error
>   message when builds fail due to warnings.
> 
> Bug: 1029357
> Change-Id: Ia69e545a110554d76e190cb2da8b20fe10d4d6e8
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2232809
> Reviewed-by: Dirk Pranke <dpranke@google.com>
> Reviewed-by: Peter Wen <wnwen@chromium.org>
> Commit-Queue: Andrew Grieve <agrieve@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#790225}

TBR=wnwen@chromium.org,dpranke@google.com,agrieve@chromium.org

Change-Id: Id123fab1cdcbbd99c137ea5750719fe68b05440c
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1029357
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2308411Reviewed-by: Anders Hartvoll Ruud <andruud@chromium.org>
Commit-Queue: Anders Hartvoll Ruud <andruud@chromium.org>
Cr-Commit-Position: refs/heads/master@{#790287}