WKWebView: Show certificate information for SSL locks on iOS9.
cert id and content status should be updated if one of the following occur:
- in webView:didCommitNavigation: callback
- certificateChain KVO fires and load is not web::LOAD_REQUESTED
- hasOnlySecureContent KVO fires and load is not web::LOAD_REQUESTED
If KVO fires and loadPhase is web::LOAD_REQUESTED then change is happening
for a pending navigation entry and should be ignored.
BUG=462425
Review URL: https://codereview.chromium.org/
1228903003
Cr-Commit-Position: refs/heads/master@{#338575}