[DevTools] Migrate Popover to GlassPane

third_party/WebKit/Source/devtools/front_end/object_ui/objectPopover.css

 /*
  * Copyright 2017 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.
  */
 
+.object-popover-content {
+    display: block;
+    position: relative;
+    overflow: hidden;
+}
+
 .object-popover-title {
     text-overflow: ellipsis;
     overflow: hidden;
     white-space: nowrap;
     font-weight: bold;
     padding-left: 18px;
+    padding-bottom: 2px;
 }
 
 .object-popover-tree {
     border-top: 1px solid rgb(184, 184, 184);
     overflow: auto;
-    position: absolute;
-    top: 21px;
-    bottom: 5px;
-    left: 5px;
-    right: 5px;
-    margin-top: 1px;
+    width: 100%;
+    height: calc(100% - 13px);
 }
 
 .object-popover-container {
     display: inline-block;
 }
 
 .function-popover-title {
     border-bottom: 1px solid #AAA;
     margin-bottom: 3px;
     padding-bottom: 2px;
@@ skipping 11 matching lines @@
     align-items: center;
     position: relative;
     margin-left: 10px;
 }
 
 .function-location-step-into {
     position: relative;
     height: 14px;
     transform: rotate(-90deg);
 }