Remove outdated examples and framework pieces

sky/framework/inspector/page-agent.sky

-<import src="../xmlhttprequest.sky" as="XMLHttpRequest" />
-<script>
-class Page {
-  constructor(delegate) {
-    this.delegate_ = delegate;
-    Object.preventExtensions(this);
-  }
-
-  enable() {
-  }
-
-  canScreencast() {
-    return {
-      result: false
-    };
-  }
-
-  canEmulate() {
-    return {
-      result: false
-    };
-  }
-
-  getResourceContent(params, messageId) {
-    var request = new XMLHttpRequest;
-    request.onload = function() {
-      var message = {
-        'content' : request.responseText,
-      };
-      this.delegate_.sendResponse(messageId, message);
-    }.bind(this);
-    request.open("GET", params.url);
-    request.send();
-
-    return this.delegate_.ASYNC_RESPONSE;
-  }
-
-  getResourceTree() {
-    // Unclear if this is all needed, but if we don't return something here
-    // the inspector hits an exception in WebInspector.ResourceTreeModel.
-    return {
-      "frameTree": {
-        "frame": {
-          "id": "1",
-          "loaderId": "1",
-          "url": String(document.URL),
-          "mimeType": "text/html",
-          "securityOrigin": String(document.URL),
-        },
-        "resources": arrayFromIterator(resourcesMapForSubtree(document).values()),
-      }
-    };
-  }
-}
-
-// FIXME: ES6 has Array.from which theoretically does this.
-function arrayFromIterator(iterator) {
-  var a = [];
-  for (var e of iterator)
-    a.push(e);
-  return a;
-}
-
-// FIXME: NodeList will soon inherit from array.
-function forEachInNodeList(array, callback, scope) {
-  for (var i = 0; i < array.length; i++) {
-    callback.call(scope, array[i]);
-  }
-}
-
-function addResource(map, url, type, mimeType) {
-  // Be sure to string the url object since has(new Object)
-  // will always return false.
-  var absoluteURL = String(new URL(url, document.URL));
-  if (map.has(absoluteURL))
-    return;
-  map.set(absoluteURL, {
-    'url': String(absoluteURL),
-    'type': type,
-    'mimeType': mimeType,
-  })
-}
-
-function resourcesMapForSubtree(root_doc) {
-  var map = new Map;
-  var roots = [root_doc];
-  while (roots.length) {
-    var root = roots.pop();
-    var elements = root.querySelectorAll('*');
-    forEachInNodeList(elements, function(element) {
-      if (element.tagName == "import") {
-        // FIXME: It's no longer possible to walk into an import. :(
-        // roots.push(element.import);
-        addResource(map, element.getAttribute('src'), 'Document', 'text/html');
-      } else if (element.tagName == "img") {
-        // FIXME: Can't determine the type of an image from the DOM.
-        addResource(map, element.getAttribute('src'), 'Image', 'image/unknown');
-      }
-      if (element.shadowRoot) {
-        roots.push(element.shadowRoot);
-      }
-    });
-  }
-  return map;
-}
-
-module.exports = Page;
-</script>