[DevTools] Add minimum size to WebInspector.View.

Source/devtools/front_end/splitView.css

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  * 1. Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *
@@ skipping 44 matching lines @@
 }
 
 .split-view.vbox > .split-view-resizer {
     position: absolute;
     left: 0;
     right: 0;
     height: 6px;
     z-index: 500;
 }
 
-.split-view > .split-view-resizer > .split-view-resizer-border {
-    width: 100%;
-    height: 100%;
+.split-view-resizer-border {
     pointer-events: none;
 }
 
 .split-view.vbox > .split-view-resizer > .split-view-resizer-border {
-    margin: 3px 0;
+    width: 100%;
+    margin-top: 3px;
+    height: 1px;
     border-top: 1px solid rgb(64%, 64%, 64%);
 }
 
 .split-view.hbox > .split-view-resizer > .split-view-resizer-border {
-    margin: 0 3px;
+    height: 100%;
+    margin-left: 3px;
+    width: 1px;
     border-left: 1px solid rgb(64%, 64%, 64%);
 }
 
 .split-view button.sidebar-show-hide-button {
     position: absolute;
     background-image: none;
     height: 16px;
     width: 16px;
     border: none;
     z-index: 10;
@@ skipping 59 matching lines @@
 
 .split-view button.bottom-sidebar-show-hide-button.toggled-show > .glyph {
     -webkit-mask-position: -296px -76px; /* <| */
     -webkit-transform: rotate(90deg);
 }
 
 .split-view button.bottom-sidebar-show-hide-button.toggled-hide > .glyph {
     -webkit-mask-position: -264px -76px; /* >| */
     -webkit-transform: rotate(90deg);
 }