Fix unrecoverable SSL interstitials.

ios/public/provider/chrome/browser/browser_constants.h

Index: ios/public/provider/chrome/browser/browser_constants.h
diff --git a/ios/public/provider/chrome/browser/browser_constants.h b/ios/public/provider/chrome/browser/browser_constants.h
new file mode 100644
index 0000000000000000000000000000000000000000..b40b26b18adedec1c3de48e59dce0ceca719f44e
--- /dev/null
+++ b/ios/public/provider/chrome/browser/browser_constants.h
@@ -0,0 +1,17 @@
+// Copyright 2013 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.
+
+#ifndef IOS_PUBLIC_PROVIDER_CHROME_BROWSER_BROWSER_CONSTANTS_H_
+#define IOS_PUBLIC_PROVIDER_CHROME_BROWSER_BROWSER_CONSTANTS_H_
+
+namespace ios {
+
+// This string is a flag for net::SSLInfo signaling that the error is not a
+// typical certificate error, but rather is a spoofing attempt.
+// It can be used to customize the interstitial error page.
+extern const char kSpoofingAttemptFlag[];
+
+}  // namespace ios
+
+#endif  // IOS_PUBLIC_PROVIDER_CHROME_BROWSER_BROWSER_CONSTANTS_H_