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After CL: https://codereview.chromium.org/369703002, Android
WebView just has a NULL SSLHostStateDelegate. So it does not remember
any user decisions on SSL errors. This is a regression of behavior from
L (m37).

History:
JB behavior: Larger error codes are assumed to have higher severity. And
if the user has allowed an SSL error with a high severity, the user
won't be prompted for a lower severity SSL error.

K and L behavior: A specific SSL error will be allowed only if the error
bit field is a subset of previously allowed error codes.

trunk behavior for webview (without this patch): We don't remember
user's decision at all.

This CL:
Maintain the same behavior with K and L.

BUG=441065

Review URL: https://codereview.chromium.org/794023002

Cr-Commit-Position: refs/heads/master@{#308160}