Stop bundletool.py from unnecessarily outputting to STDOUT

bundletool.py calls the java bundle tool but also prints its output to
stdout. This is noise in the build log [1] which should only contain
errors and warning and should be empty otherwise.

[1] eg: building monochrome_public_minimal_apks outputs the entire
bundle manifest to stdout.

Change-Id: I2449c7bb5c93398afc18204932566801e385e4e2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2031965Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Commit-Queue: Andrew Grieve <agrieve@chromium.org>
Auto-Submit: Mohamed Heikal <mheikal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#737051}

build/android/gyp/bundletool.py

@@ -29,7 +29,6 @@ def RunBundleTool(args):
   logging.debug(' '.join(args))
   return build_utils.CheckOutput(
       args,
-      print_stdout=True,
       print_stderr=True,
       stderr_filter=build_utils.FilterReflectiveAccessJavaWarnings)