DevTools: always use CodeMirror for response preview

third_party/WebKit/Source/devtools/front_end/source_frame/resourceSourceFrame.css

Index: third_party/WebKit/Source/devtools/front_end/source_frame/resourceSourceFrame.css
diff --git a/third_party/WebKit/Source/devtools/front_end/source_frame/resourceSourceFrame.css b/third_party/WebKit/Source/devtools/front_end/source_frame/resourceSourceFrame.css
deleted file mode 100644
index b90af023aa1b15a5cedd0c986aa7956b23a75a4d..0000000000000000000000000000000000000000
--- a/third_party/WebKit/Source/devtools/front_end/source_frame/resourceSourceFrame.css
+++ /dev/null
@@ -1,13 +0,0 @@
-/*
- * Copyright (c) 2014 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.
- */
-
-.resource-source-frame-fallback {
-    background-color: #eee;
-    word-wrap: break-word;
-    white-space: pre-wrap;
-    -webkit-user-select: text;
-    overflow: auto;
-}