Rename insert() to insertChildRoot() so it's consistent with detachChildRoot().

sky/sdk/lib/widgets/basic.dart

Index: sky/sdk/lib/widgets/basic.dart
diff --git a/sky/sdk/lib/widgets/basic.dart b/sky/sdk/lib/widgets/basic.dart
index 02620d86c5ebabdd28bfd3e7bc6191cdaa3ff53a..2f221b7688b8d1d7b95078118f658fb1cd79f0df 100644
--- a/sky/sdk/lib/widgets/basic.dart
+++ b/sky/sdk/lib/widgets/basic.dart
@@ -359,7 +359,7 @@ class Inline extends RenderObjectWrapper {
     root.inline = text;
   }
 
-  void insert(RenderObjectWrapper child, dynamic slot) {
+  void insertChildRoot(RenderObjectWrapper child, dynamic slot) {
     assert(false);
     // Inline does not support having children currently
   }
@@ -398,7 +398,7 @@ class Image extends RenderObjectWrapper {
     root.requestedSize = size;
   }
 
-  void insert(RenderObjectWrapper child, dynamic slot) {
+  void insertChildRoot(RenderObjectWrapper child, dynamic slot) {
     assert(false);
     // Image does not support having children currently
   }
@@ -424,7 +424,7 @@ class WidgetToRenderBoxAdapter extends RenderObjectWrapper {
     }
   }
 
-  void insert(RenderObjectWrapper child, dynamic slot) {
+  void insertChildRoot(RenderObjectWrapper child, dynamic slot) {
     assert(false);
     // WidgetToRenderBoxAdapter cannot have Widget children; by
     // definition, it is the transition out of the Widget world.