DevTools: Fix network overview on hidpi

Source/devtools/front_end/network/networkPanel.css

 /*
  * Copyright (C) 2006, 2007, 2008 Apple Inc.  All rights reserved.
  * Copyright (C) 2009 Anthony Ricaud <rik@webkit.org>
  *
  * 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 167 matching lines @@
 
 #network-overview-container {
     overflow: hidden;
     flex: auto;
     display: flex;
     flex-direction: column;
     position: relative;
     border-bottom: 1px solid #CDCDCD;
 }
 
+#network-overview-container canvas {
+    width: 100%;
+    height: 100%;
+}
+
 #network-overview-grid .resources-dividers-label-bar {
     pointer-events: auto;
 }
 
 .network .network-overview {
     flex: 0 0 100px;
 }
 
 .network-overview .overview-grid-window,
 .network-overview .overview-grid-dividers-background {
@@ skipping 19 matching lines @@
 .request-view.html iframe {
     width: 100%;
     height: 100%;
     position: absolute;
 }
 
 .network-film-strip {
     border-bottom: solid 1px #cdcdcd;
     flex: none !important;
 }