Organize security panel main view.

Source/devtools/front_end/security/securityPanel.css

-/* Copyright (c) 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.
- */
-
-.security-main-view {
-    -webkit-user-select: text;
-    margin: 1em;
-}
-
-.security-main-view .lock-icon {
-    display: inline-block;
-    margin: 0.2em;
-    vertical-align: middle;
-}
-
-.security-main-view .security-state {
-    display: inline-block;
-    font-size: 1.2em;
-    font-weight: bold;
-    margin: 0.2em;
-    vertical-align: middle;
-}
-
-.security-explanation {
-    margin: 16px 0px;
-}
-
-.security-explanation .lock-icon {
-    display: inline-block;
-    vertical-align: bottom;
-}
-
-.security-explanation .explanation-title {
-    display: inline-block;
-    font-size: 1.2em;
-    font-weight: bold;
-    margin-left: 4px;
-}
-
-.security-explanation .explanation-text {
-    margin: 4px 0px;
-}