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Although proguard is run in release, incremental install always uses the
debug dex files, and we so we don't bother running proguard.

This elimnates a FileNotFound log message when launching an apk that was
build with is_java_debug=false incremental_install=true

Change-Id: I5a955ca2b076ebd1bc0f13a28191b72364603ebe
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2142633
Auto-Submit: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Peter Wen <wnwen@chromium.org>
Commit-Queue: Peter Wen <wnwen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#757562}