chore(compiler): dead code clean-up.

Dead code that uglifyJS found.

Closes #4907

modules/angular2/src/core/render/dom/dom_renderer.ts

@@ -322,15 +322,6 @@ function moveNodesAfterSibling(sibling, nodes) {
   }
 }
 
-function moveChildNodes(source: Node, target: Node) {
-  var currChild = DOM.firstChild(source);
-  while (isPresent(currChild)) {
-    var nextChild = DOM.nextSibling(currChild);
-    DOM.appendChild(target, currChild);
-    currChild = nextChild;
-  }
-}
-
 function decoratePreventDefault(eventHandler: Function): Function {
   return (event) => {
     var allowDefaultBehavior = eventHandler(event);

modules/angular2/src/core/render/view_factory.ts

@@ -252,9 +252,3 @@ class Component<N> {
                [];
   }
 }
-
-function addAll(source: any[], target: any[]) {
-  for (var i = 0; i < source.length; i++) {
-    target.push(source[i]);
-  }
-}