Always call WebView.onPageStarted(), regardless of whether a WebViewClient has been set

This makes sure that the page's SSL certificate is cleared when the page load
starts.

Follows on from https://android-git.corp.google.com/g/#/c/138147.

Bug: 5287216
Change-Id: I40f74a72dc495c48d7167b7b70a845a8481feb85
1 file changed