Revert of WKWebView: Added cert verification API to web controller. (patchset #26...

Revert of WKWebView: Added cert verification API to web controller. (patchset #26 id:490001 of https://codereview.chromium.org/1230033005/ )

Reason for revert:
Compile failed

ios/web/net/cert_verifier_block_adapter.cc:28:26: error: no member named 'SOURCE_IOS_WEB_VIEW_CERT_VERIFIER' in 'net::NetLog'

Original issue's description:
> WKWebView: Added cert verification API to web controller.
>
> This code is just a skeleton for verification and verification method
> is not used for making security decisions or presenting security UI.
>
> The decision to use CertVerifier instead of iOS cert verification API
> has not been made yet. But using CertVerifier is easier for
> -[WKWebView certificateChain] verification, so this CL uses
> CertVerifier.
>
> BUG=462427,462425
>
> Committed: https://crrev.com/dc5f11025e1db3b7766bf5faeacc316969b519b2
> Cr-Commit-Position: refs/heads/master@{#347302}

TBR=rsleevi@chromium.org,stuartmorgan@chromium.org,davidben@chromium.org,eugenebut@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=462427,462425

Review URL: https://codereview.chromium.org/1306733006

Cr-Commit-Position: refs/heads/master@{#347304}