DevTools: simplify Service Workers panel UI, remove non-actionable data.

third_party/WebKit/Source/devtools/front_end/emulation/deviceModeView.css

 /*
  * Copyright 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.
  */
 
 :host {
     overflow: hidden;
     align-items: stretch;
     flex: auto;
@@ skipping 22 matching lines @@
 .device-mode-toolbar-spacer {
     flex: 1 1 0;
     display: flex;
     flex-direction: row;
     overflow: hidden;
 }
 
 .device-mode-content-clip {
     overflow: hidden;
     flex: auto;
+    z-index: 0;

[caseq, 2016/05/05 01:09:21]

unrelated?

 }
 
 .device-mode-media-container {
     flex: none;
     overflow: hidden;
     box-shadow: inset 0 -1px #ccc;
 }
 
 .device-mode-presets-container {
     flex: 0 0 20px;
@@ skipping 274 matching lines @@
 .device-mode-ruler-top .device-mode-ruler-text {
     left: 2px;
     top: -2px;
 }
 
 .device-mode-ruler-left .device-mode-ruler-text {
     left: -4px;
     top: -15px;
     transform: rotate(270deg);
 }