NPAPI redirects should be treated as nested subresources.
NPAPI redirects should be treated as nested subresources.

https://codereview.chromium.org/815483002 changed WebLocalFrameImpl to
handle mixed content checking for NPAPI redirects via ::shouldBlockFetch.
The frame type was set incorrectly, however, which causes checks to fail
that shouldn't.

BUG=464629

Review URL: https://codereview.chromium.org/1004573003

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@191774 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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