[DevTools] Fix ObjectPopover for objects not staying the same size

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;
+    flex: 1 1 auto;
 }
 
 .object-popover-title {
     text-overflow: ellipsis;
     overflow: hidden;
     white-space: nowrap;
     font-weight: bold;
     padding-left: 18px;
     padding-bottom: 2px;
 }
@@ skipping 27 matching lines @@
     align-items: center;
     position: relative;
     margin-left: 10px;
 }
 
 .function-location-step-into {
     position: relative;
     height: 14px;
     transform: rotate(-90deg);
 }