Remove onBlocked() function from WebIDBCallbacks.
Remove onBlocked() function from WebIDBCallbacks.

Looks like this functions is marked as deprecated and thus should be removed,
since there is no Chromium users we can remove this safely.

BUG=None
TEST=None, no functional change.
R=dgrogan@chromium.org,abarth@chromium.org

Review URL: https://chromiumcodereview.appspot.com/23475050

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@157969 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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