Remove the WARNING security level.

chrome/browser/ssl/chrome_security_state_model_client.cc

Index: chrome/browser/ssl/chrome_security_state_model_client.cc
diff --git a/chrome/browser/ssl/chrome_security_state_model_client.cc b/chrome/browser/ssl/chrome_security_state_model_client.cc
index 1fe022041d1d764b4596f6270ba8fd620b6cb33d..604d45ab6bf498e8329e7b22e7f8428c27989cf8 100644
--- a/chrome/browser/ssl/chrome_security_state_model_client.cc
+++ b/chrome/browser/ssl/chrome_security_state_model_client.cc
@@ -55,10 +55,6 @@ SecurityStateModel::SecurityLevel GetSecurityLevelForSecurityStyle(
       return SecurityStateModel::NONE;
     case content::SECURITY_STYLE_AUTHENTICATION_BROKEN:
       return SecurityStateModel::SECURITY_ERROR;
-    case content::SECURITY_STYLE_WARNING:
-      // content currently doesn't use this style.
-      NOTREACHED();
-      return SecurityStateModel::SECURITY_WARNING;
     case content::SECURITY_STYLE_AUTHENTICATED:
       return SecurityStateModel::SECURE;
   }
@@ -72,10 +68,8 @@ content::SecurityStyle SecurityLevelToSecurityStyle(
     SecurityStateModel::SecurityLevel security_level) {
   switch (security_level) {
     case SecurityStateModel::NONE:
-      return content::SECURITY_STYLE_UNAUTHENTICATED;
-    case SecurityStateModel::SECURITY_WARNING:
     case SecurityStateModel::SECURITY_POLICY_WARNING:
-      return content::SECURITY_STYLE_WARNING;
+      return content::SECURITY_STYLE_UNAUTHENTICATED;

[estark, 2016/09/14 01:21:54]

Hrmm, this means that we'll show "This page is not secure" in devtools for this
state. That seems confusing.

On the other hand, right now it looks like we don't show anything at all for
this state. :(

(https://cs.chromium.org/chromium/src/third_party/WebKit/Source/devtools/front...)

     case SecurityStateModel::EV_SECURE:
     case SecurityStateModel::SECURE:
       return content::SECURITY_STYLE_AUTHENTICATED;