Refactor connection_security into SecurityStateModel

chrome/android/java/src/org/chromium/chrome/browser/ssl/ConnectionSecurity.java

-// 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.
-
-package org.chromium.chrome.browser.ssl;
-
-import org.chromium.content_public.browser.WebContents;
-
-/**
- * Provides a way of accessing helpers for connection security levels.
- */
-public class ConnectionSecurity {
-    /**
-     * Fetch the security level for a given web contents.
-     *
-     * @param webContents The web contents to get the security level for.
-     * @return The ConnectionSecurityLevel for the specified web contents.
-     *
-     * @see ConnectionSecurityLevel
-     */
-    public static int getSecurityLevelForWebContents(WebContents webContents) {
-        if (webContents == null) return ConnectionSecurityLevel.NONE;
-        return nativeGetSecurityLevelForWebContents(webContents);
-    }
-
-    private ConnectionSecurity() {}
-
-    private static native int nativeGetSecurityLevelForWebContents(WebContents webContents);
-}