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We already were silencing most of this via stdout filtering, but there
are still some third-party libraries that were showing warnings. E.g.:

Warning: can't write resource [META-INF/maven/com.google.guava/guava/pom.xml] (Duplicate zip entry [espresso-core-release-no-dep.jar:META-INF/maven/com.google.guava/guava/pom.xml])

This change tells ProGuard to ignore these files, rather than filtering
the resulting errors

Change-Id: I288507de1f2c5576fbb0fea8bfebb189b2603c92
Reviewed-on: https://chromium-review.googlesource.com/963699Reviewed-by: Eric Stevenson <estevenson@chromium.org>
Commit-Queue: agrieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543527}