Convert some more view methods to the ui/views style.

views/controls/textfield/native_textfield_win.cc

Index: views/controls/textfield/native_textfield_win.cc
===================================================================
--- views/controls/textfield/native_textfield_win.cc	(revision 92600)
+++ views/controls/textfield/native_textfield_win.cc	(working copy)
@@ -462,7 +462,7 @@
     // Try to find the name of this text field.
     // We expect it to be a Label preceeding this view (if it exists).
     string16 name;
-    View* label_view = parent->GetChildViewAt(label_index);
+    View* label_view = parent->child_at(label_index);
     if (label_view->GetClassName() == Label::kViewClassName) {
       ui::AccessibleViewState state;
       label_view->GetAccessibleState(&state);