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This is the first CL in a sequence that converts all java
protobuf uses from nano to lite. It disables one proguard
optimization that breaks with lite-generated code.

Bug: 782237
Change-Id: Ifed32f216dacad69c1f32e903d8d30070070404b
Reviewed-on: https://chromium-review.googlesource.com/808684Reviewed-by: Tommy Nyquist <nyquist@chromium.org>
Reviewed-by: agrieve <agrieve@chromium.org>
Commit-Queue: Jan Krcal <jkrcal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543317}