DevTools: move filter bar into the style toolbar

Source/devtools/front_end/elements/computedStyleSidebarPane.css

 /*
  * Copyright (c) 2015 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.
  */
 
-.computed-style-sidebar-pane {
+.computed-properties {
     padding: 2px 2px 4px 4px;
-}
-
-.computed-properties {
     -webkit-user-select: text;
 }
 
 .computed-style-property-inherited {
     opacity: 0.5;
 }
 
 .computed-style-trace-button {
     display: none;
     position: absolute;
@@ skipping 31 matching lines @@
 @media (-webkit-min-device-pixel-ratio: 1.5) {
 .computed-style-trace-button > .glyph {
     -webkit-mask-image: url(Images/toolbarButtonGlyphs_2x.png);
 }
 } /* media */
 
 .computed-style-property {
     position: relative;
     padding-left: 14px;
 }