Update from https://crrev.com/333737

mojo/services/view_manager/public/cpp/lib/view_private.h

Index: mojo/services/view_manager/public/cpp/lib/view_private.h
diff --git a/mojo/services/view_manager/public/cpp/lib/view_private.h b/mojo/services/view_manager/public/cpp/lib/view_private.h
index 0b582806c53ef01e8e491a37c46d76b52cdfe90f..1d149a56170554d7fa77d470a51741194bc90287 100644
--- a/mojo/services/view_manager/public/cpp/lib/view_private.h
+++ b/mojo/services/view_manager/public/cpp/lib/view_private.h
@@ -19,7 +19,7 @@ class ViewPrivate {
   // Creates and returns a new View. Caller owns the return value.
   static View* LocalCreate();
 
-  ObserverList<ViewObserver>* observers() { return &view_->observers_; }
+  base::ObserverList<ViewObserver>* observers() { return &view_->observers_; }
 
   void ClearParent() { view_->parent_ = NULL; }