DevTools: migrate SSP Classes and ElementState toolbar widgets to shadow

third_party/WebKit/Source/devtools/front_end/elements/classesPaneWidget.css

+/**
+ * Copyright 2017 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.
+ */
+
+.styles-element-classes-pane {
+    background-color: #f3f3f3;
+    border-bottom: 1px solid rgb(189, 189, 189);
+    padding: 6px 2px 2px;
+}
+
+.styles-element-classes-container {
+    display: flex;
+    flex-wrap: wrap;
+    justify-content: flex-start;
+}
+
+.styles-element-classes-pane label {
+    margin-right: 15px;
+}
+
+.styles-element-classes-pane .title-container {
+    padding-bottom: 2px;
+}
+
+.styles-element-classes-pane .new-class-input {
+    padding-left: 3px;
+    padding-right: 3px;
+    overflow: hidden;
+    border: 1px solid #ddd;
+    line-height: 15px;
+    margin-left: 3px;
+    width: calc(100% - 7px);
+    background-color: #fff;
+    cursor: text;
+}