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No change in logic.

This creates an initial implementation of a new WebView-specific
blocking page. This has no change in logic, but paves the way for
choosing between two different blocking pages (loud and quiet).

Currently, all this does is specify SBErrorDisplayOptions without
depending on the defaults set in BaseBlockingPage.

This exposes CreateControllerClient() in BaseBlockingPage as protected
so that AwSafeBrowsingBlockingPage can take advantage of it.

BUG=718545

Review-Url: https://codereview.chromium.org/2863723002
Cr-Commit-Position: refs/heads/master@{#469488}