DevTools: move FileSystemMapping under persistence/ module

third_party/WebKit/Source/devtools/front_end/persistence/workspaceSettingsTab.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.
+ */
+
+header {
+    padding: 0 0 6px;
+    border-bottom: 1px solid #EEEEEE;
+}
+
+header > h3 {
+    font-size: 18px;
+    font-weight: normal;
+    margin: 0;
+    padding-bottom: 3px;
+}
+
+.help-content {
+    overflow-y: auto;
+    overflow-x: hidden;
+    margin: 8px 8px 8px 0;
+    padding: 0 4px;
+    flex: auto;
+}
+
+.help-container {
+    width: 100%;
+    -webkit-user-select: auto;
+    -webkit-column-width: 288px;
+}
+
+
+.settings-tab.help-container {
+    -webkit-column-width: 308px;
+}
+
+.settings-tab label {
+    padding-right: 4px;
+    display: inline-flex;
+}
+
+.help-container-wrapper {
+    position: absolute;
+    top: 31px;
+    left: 0px;
+    right: 0;
+    bottom: 0;
+    overflow: auto;
+    padding-top: 9px;
+}
+
+.settings-tab.help-content {
+    margin: 0;
+    padding: 0;
+}
+
+.settings-tab input:not([type]),
+.settings-tab input[type="text"] {
+    border: 1px solid rgb(213, 213, 213);
+    border-radius: 2px;
+    color: #444444;
+    padding: 3px;
+}
+
+.settings-tab p {
+    margin: 12px 0;
+}
+
+p.folder-exclude-pattern {
+    display: flex;
+    align-items: center;
+}
+
+p.folder-exclude-pattern > input {
+    flex: auto;
+}
+
+.settings-tab .file-system-container {
+    border-top: 1px solid #aaa;
+    padding: 19px 0 10px;
+    margin: 20px 0;
+}
+
+.settings-tab .file-system-header {
+    display: flex;
+    flex-direction: row;
+    align-items: center;
+}
+
+.settings-tab .file-system-name {
+    font-weight: bold;
+    flex: none;
+    margin-right: 10px;
+    font-size: 15px;
+    overflow: hidden;
+    text-overflow: ellipsis;
+    max-width: 70%;
+}
+
+.settings-tab .file-system-path {
+    white-space: nowrap;
+    overflow: hidden;
+    text-overflow: ellipsis;
+    flex: auto;
+}
+
+.settings-info-message {
+    background-color: #eee;
+    padding: 10px;
+    margin: 20px 0;
+}
+
+.settings-tab.help-content.help-container {
+    -webkit-column-width: initial;
+    overflow: hidden;
+    padding-right: 10px;
+}