WKWebView: Implemented recoverable SSL interstitials.

ios/web/web_state/wk_web_view_security_util.mm

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import "ios/web/web_state/wk_web_view_security_util.h"
 
 #include "base/mac/scoped_cftyperef.h"
 #include "base/strings/sys_string_conversions.h"
 #include "net/cert/x509_certificate.h"
 #include "net/ssl/ssl_info.h"
 
 namespace web {
 
-// This key was determined by inspecting userInfo dict of an SSL error.
+// These keys were determined by inspecting userInfo dict of an SSL error.
 NSString* const kNSErrorPeerCertificateChainKey =
     @"NSErrorPeerCertificateChainKey";
-
+NSString* const kNSErrorFailingURLKey = @"NSErrorFailingURLKey";
 }
 
 namespace {
 
 // Maps NSError code to net::CertStatus.
 net::CertStatus GetCertStatusFromNSErrorCode(NSInteger code) {
   switch (code) {
     // Regardless of real certificate problem the system always returns
     // NSURLErrorServerCertificateUntrusted. The mapping is done in case this
     // bug is fixed (rdar://18517043).
@@ skipping 107 matching lines @@
     case kSecTrustResultRecoverableTrustFailure:
     case kSecTrustResultFatalTrustFailure:
     case kSecTrustResultOtherError:
       return SECURITY_STYLE_AUTHENTICATION_BROKEN;
   }
   NOTREACHED();
   return SECURITY_STYLE_UNKNOWN;
 }
 
 }  // namespace web