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When verifying that the cached doodle is still valid, we load the doodle
URL and append the query param "async=es_dfp:<fingerprint>". Previously,
the ":" was being escape to "%3A", causing the server to respond with a
400 error. This mollifies the server by keeping the colon unescaped.

BUG=413845

Review URL: https://codereview.chromium.org/587943003

Cr-Commit-Position: refs/heads/master@{#296512}