[Android] Disable the deletions-only check for findbugs_known_bugs.txt.

The deletions-only check is causing a lot of issues with the upstreaming
effort, so I'm disabling it temporarily.

BUG=

Review URL: https://codereview.chromium.org/820053003

Cr-Commit-Position: refs/heads/master@{#311476}

build/android/PRESUBMIT.py

@@ -69,7 +69,8 @@ def CommonChecks(input_api, output_api):
           J('pylib', 'utils', 'md5sum_test.py'),
       ],
       env=pylib_test_env))
-  output.extend(_CheckDeletionsOnlyFiles(input_api, output_api))
+  # TODO(jbudorick): Reenable this check once upstreaming is finished.
+  # output.extend(_CheckDeletionsOnlyFiles(input_api, output_api))
   return output