Call WebContentsObserver::DidChangeVisibleSecurityState unconditionally

Both WebContentsDelegate and WCO have DidChangeVisibleSecurityState
methods. The WCO method was previously only being called if there was
a delegate. This broke some unit testing scenarios in which we want to
exercise a WCO method but there is no delegate, and there's no reason
for the two to be tied together.

Change-Id: Icff39b26317ff9cf7c373cfba02ed1e66a231e0a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1579102
Commit-Queue: Emily Stark <[email protected]>
Reviewed-by: Alex Moshchuk <[email protected]>
Cr-Commit-Position: refs/heads/master@{#654562}
1 file changed