DevTools: remove BreakpointsSidebarPaneBase and breakpointsList.css

third_party/WebKit/Source/devtools/front_end/components/domBreakpointsSidebarPane.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.
+ */
+
+.breakpoint-list {
+    padding-bottom: 3px;
+}
+
+.breakpoint-list .dom-breakpoint > div {
+    overflow: hidden;
+    text-overflow: ellipsis;
+}
+
+.breakpoint-entry {
+    display: flex;
+    white-space: nowrap;
+    text-overflow: ellipsis;
+    overflow: hidden;
+    padding: 2px 0;
+}
+
+.breakpoint-list .breakpoint-entry:hover {
+    background-color: #eee;
+}
+
+.breakpoint-hit {
+    background-color: rgb(255, 255, 194);
+}
+
+:host-context(.-theme-with-dark-background) .breakpoint-hit {
+    background-color: hsl(46, 98%, 22%);
+    color: #ccc;
+}