Remove support for -webkit-canvas and Document.getCSSCanvasContext.

third_party/WebKit/Source/core/xml/DocumentXMLTreeViewer.js

 // Copyright 2014 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.
 
 "use strict";
 
 var xmlTreeViewerCSS = privateScriptController.import("DocumentXMLTreeViewer.css");
 
 privateScriptController.installClass("Document", function(DocumentPrototype) {
     var nodeParentPairs = [];
@@ skipping 41 matching lines @@
         var sourceXML = document.getElementById('webkit-xml-viewer-source-xml');
         if (!sourceXML)
             return; // Stop if some XML tree extension is already processing this document
 
         for (var child = sourceXML.firstChild; child; child = child.nextSibling)
             nodeParentPairs.push({parentElement: tree, node: child});
 
         for (var i = 0; i < nodeParentPairs.length; i++)
             processNode(nodeParentPairs[i].parentElement, nodeParentPairs[i].node);
 
-        drawArrows();
         initButtons();
 
         return false;
     }
 
     // Tree processing.
 
     function processNode(parentElement, node)
     {
         var map = processNode.processorsMap;
@@ skipping 260 matching lines @@
         var textAfter = document.createTextNode('"');
 
         attribute.appendChild(textBefore);
         attribute.appendChild(attributeName);
         attribute.appendChild(textBetween);
         attribute.appendChild(attributeValue);
         attribute.appendChild(textAfter);
         return attribute;
     }
 
-    // Tree behaviour.
-
-    function drawArrows()
-    {
-        var ctx = document.getCSSCanvasContext("2d", "arrowRight", 10, 11);
-
-        ctx.fillStyle = "rgb(90,90,90)";
-        ctx.beginPath();
-        ctx.moveTo(0, 0);
-        ctx.lineTo(0, 8);
-        ctx.lineTo(7, 4);
-        ctx.lineTo(0, 0);
-        ctx.fill();
-        ctx.closePath();
-
-        var ctx = document.getCSSCanvasContext("2d", "arrowDown", 10, 10);
-
-        ctx.fillStyle = "rgb(90,90,90)";
-        ctx.beginPath();
-        ctx.moveTo(0, 0);
-        ctx.lineTo(8, 0);
-        ctx.lineTo(4, 7);
-        ctx.lineTo(0, 0);
-        ctx.fill();
-        ctx.closePath();
-    }
-
     function expandFunction(sectionId)
     {
         return function()
         {
             document.querySelector('#' + sectionId + ' > .expanded').className = 'expanded';
             document.querySelector('#' + sectionId + ' > .collapsed').className = 'collapsed hidden';
         };
     }
 
     function collapseFunction(sectionId)
@@ skipping 29 matching lines @@
     {
        // To prevent selection on double click
        e.preventDefault();
     }
 
     DocumentPrototype.transformDocumentToTreeView = function(noStyleMessage) {
         prepareWebKitXMLViewer(noStyleMessage);
     }
 });