Remove old cc-frame-viewer now that it is upstreamed into trace_viewer

tools/cc-frame-viewer/src/model_view.css

-/* Copyright (c) 2012 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. */
-
-x-model-view {
-    display: -webkit-flex;
-    -webkit-flex-direction: column;
-    min-width: 0;
-}
-
-x-model-view {
-    -webkit-user-select: none;
-    cursor: default;
-}
-
-x-model-view > .lthi-picker {
-    padding: 2px 1px 2px 1px;
-    background-color: rgb(128, 128, 128);
-    border-bottom: 1px solid black;
-}
-
-x-model-view > .lthi-view {
-    -webkit-flex: 1;
-    display: -webkit-flex;
-    min-height: 0;
-}
-
-x-model-view > .lthi-view > .lthi-and-analysis-view {
-    -webkit-flex: 1;
-    display: -webkit-flex;
-    -webkit-flex-direction: column;
-    min-height: 0;
-    min-width: 0;
-}
-
-x-model-view > .lthi-view > .lthi-and-analysis-view > x-lthi-view {
-    min-height: 0;
-    min-width: 0;
-    overflow: auto;
-}
-
-x-model-view > .lthi-view > .lthi-and-analysis-view > x-analysis-view {
-    height: 200px;
-}
-
-x-model-view > .lthi-view > .lthi-list {
-    width: 200px;
-    border-right: 1px solid black;
-    overflow-y: auto;
-}
-
-
-x-model-view x-lthi-view,
-x-model-view x-analysis-view {
-    padding: 4px 0 4px 12px;
-}