Remove node-canvas example.

examples/node-canvas/us-counties.js

-require("../../test/env");
-
-var fs = require("fs"),
-    util = require("util"),
-    Canvas = require("canvas");
-
-var w = 1920,
-    h = 1080;
-
-var projection = d3.geo.albersUsa()
-    .scale(2000)
-    .translate([w / 2, h / 2]);
-
-var path = d3.geo.path()
-    .projection(projection);
-
-var canvas = new Canvas(w, h),
-    context = canvas.getContext("2d");
-
-context.antialias = "none";
-context.lineWidth = 8;
-context.lineJoin = "round";
-
-d3.json(__dirname + "/../data/us-counties.json", function(error, collection) {
-  renderAll("stroke");
-  renderAll("fill");
-
-  var out = fs.createWriteStream("us-counties.png");
-  canvas.createPNGStream().on("data", function(chunk) { out.write(chunk); });
-
-  function renderAll(action) {
-    collection.features.forEach(function(feature) {
-      var re = /[MLZ]/g,
-          d = path(feature),
-          i = 0,
-          m;
-
-      context[action + "Style"] = "#" + pad((+feature.id).toString(16));
-      context.beginPath();
-      re.lastIndex = 1;
-      while (m = re.exec(d)) render(m.index);
-      render();
-      context[action]();
-
-      function render(j) {
-        switch (d.charAt(i)) {
-          case "M": {
-            var p = d.substring(i + 1, j).split(",").map(Number);
-            context.moveTo(p[0], p[1]);
-            break;
-          }
-          case "L": {
-            var p = d.substring(i + 1, j).split(",").map(Number);
-            context.lineTo(p[0], p[1]);
-            break;
-          }
-          case "Z": {
-            context.closePath();
-            break;
-          }
-        }
-        i = j;
-      }
-    });
-  }
-});
-
-function pad(s) {
-  return s.length < 6 ? new Array(7 - s.length).join("0") + s : s;
-}