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

tools/cc-frame-viewer/src/ui/drag_handle.css

Index: tools/cc-frame-viewer/src/ui/drag_handle.css
diff --git a/tools/cc-frame-viewer/src/ui/drag_handle.css b/tools/cc-frame-viewer/src/ui/drag_handle.css
deleted file mode 100644
index b8227960557c7e8f02e28fa3569d8e37b99ddc8b..0000000000000000000000000000000000000000
--- a/tools/cc-frame-viewer/src/ui/drag_handle.css
+++ /dev/null
@@ -1,15 +0,0 @@
-/* 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-drag-handle {
-  background-image: -webkit-gradient(linear,
-                                     0% 0%, 0% 100%,
-                                     from(#E5E5E5),
-                                     to(#D1D1D1));
-  height: 8px;
-  border-top: 1px solid white;
-  border-bottom: 1px solid #8e8e8e;
-  cursor: ns-resize;
-  -webkit-user-select: none;
-}
-