Remove Component.getRoot(), since we don't use it anymore.

sky/sdk/lib/framework/fn2.dart

Index: sky/sdk/lib/framework/fn2.dart
diff --git a/sky/sdk/lib/framework/fn2.dart b/sky/sdk/lib/framework/fn2.dart
index 40cc835fbc6be9607ae4ab2155fadafef0f79ae5..4c0b3e6d36680637a0d3681c110d84cd419726cd 100644
--- a/sky/sdk/lib/framework/fn2.dart
+++ b/sky/sdk/lib/framework/fn2.dart
@@ -888,10 +888,6 @@ abstract class Component extends UINode {
         fn();
   }
 
-  // TODO(rafaelw): It seems wrong to expose DOM at all. This is presently
-  // needed to get sizing info.
-  RenderObject getRoot() => root;
-
   void remove() {
     assert(_built != null);
     assert(root != null);