Revert of Move SecurityLevel into a class of its own

chrome/browser/ssl/connection_security_helper_android.cc

-// Copyright 2015 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.
-
-#include "base/android/jni_android.h"
-#include "base/logging.h"
-#include "chrome/browser/ssl/connection_security_helper.h"
-#include "content/public/browser/web_contents.h"
-
-// static
-jint GetSecurityLevelForWebContents(JNIEnv* env,
-                                    jclass jcaller,
-                                    jobject jweb_contents) {
-  content::WebContents* web_contents =
-      content::WebContents::FromJavaWebContents(jweb_contents);
-  DCHECK(web_contents);
-  return ConnectionSecurityHelper::GetSecurityLevelForWebContents(web_contents);
-}