[DevTools] Remove a bunch of styles from inspectorStyle.css.

third_party/WebKit/Source/devtools/front_end/network/requestHeadersView.css

 /*
  * 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.
  */
 
 .request-headers-view {
     -webkit-user-select: text;
     overflow: auto;
 }
@@ skipping 10 matching lines @@
     flex: 0 0 19px;
     padding: 0 4px;
 }
 
 .request-headers-tree {
     padding: 0 0 0 4px;
     flex-grow: 1;
     overflow-y: auto;
     margin: 0;
 }
+
+.header-decode-error {
+    color: red;
+}
+
+.-theme-with-dark-background .header-decode-error {
+    color: hsl(0, 100%, 65%);
+}