[Android] Reland CommandLine reset listeners.
This is a reland of https://codereview.chromium.org/1254973003, which I had reverted in https://codereview.chromium.org/1263433002 because I thought all calls to FeatureUtilities.isDocumentMode would now happen after CommandLineFlags.setUp was called. This was mistaken and has broken L bots. BUG=516421 TBR=yfriedman@chromium.org,dgn@chromium.org Review URL: https://codereview.chromium.org/1269083005 Cr-Commit-Position: refs/heads/master@{#341639}
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