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When the InterceptDownloadResourceThrottle intercepts the download request, the response might not have been received yet.
As a result, we are not sure about the mime type and and other file informations.
Using android Download Manager at this stage is premature and risky.
This change bypasses android download manager in this case.

BUG=394092

Review URL: https://codereview.chromium.org/394993002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@283748 0039d316-1c4b-4281-b951-d872f2087c98