Rename 'content' to 'child' in widget.dart internals, for consistency with everything else.

sky/sdk/lib/widgets/widget.dart

 // Copyright 2015 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.
 
 import 'dart:async';
 import 'dart:collection';
 import 'dart:mirrors';
 import 'dart:sky' as sky;
 
 import '../app/view.dart';
@@ skipping 147 matching lines @@
   }
 
 }
 
 
 // Descendants of TagNode provide a way to tag RenderObjectWrapper and
 // Component nodes with annotations, such as event listeners,
 // stylistic information, etc.
 abstract class TagNode extends Widget {
 
-  TagNode(Widget content, { String key })
-    : this.content = content, super(key: key);
+  TagNode(Widget child, { String key })
+    : this.child = child, super(key: key);
 
-  Widget content;
+  Widget child;
 
   void _sync(Widget old, dynamic slot) {
-    Widget oldContent = old == null ? null : (old as TagNode).content;
-    content = syncChild(content, oldContent, slot);
-    assert(content.root != null);
-    _root = content.root;
+    Widget oldChild = old == null ? null : (old as TagNode).child;
+    child = syncChild(child, oldChild, slot);
+    assert(child.root != null);
+    _root = child.root;
     assert(_root == root); // in case a subclass reintroduces it
   }
 
   void remove() {
-    if (content != null)
-      removeChild(content);
+    if (child != null)
+      removeChild(child);
     super.remove();
   }
 
   void detachRoot() {
-    if (content != null)
-      content.detachRoot();
+    if (child != null)
+      child.detachRoot();
   }
 
 }
 
 class ParentDataNode extends TagNode {
-  ParentDataNode(Widget content, this.parentData, { String key })
-    : super(content, key: key);
+  ParentDataNode(Widget child, this.parentData, { String key })
+    : super(child, key: key);
   final ParentData parentData;
 }
 
 typedef void GestureEventListener(sky.GestureEvent e);
 typedef void PointerEventListener(sky.PointerEvent e);
 typedef void EventListener(sky.Event e);
 
 class Listener extends TagNode  {
 
   Listener({
@@ skipping 673 matching lines @@
     if (root.parent == null) {
       // we haven't attached it yet
       assert(_container.child == null);
       _container.child = root;
     }
     assert(root.parent == _container);
   }
 
   Widget build() => builder();
 }