Move //mojo/services/X/public/... to //mojo/services/X/... (part 4).

mojo/services/view_manager/public/cpp/lib/view_observer.cc

Index: mojo/services/view_manager/public/cpp/lib/view_observer.cc
diff --git a/mojo/services/view_manager/public/cpp/lib/view_observer.cc b/mojo/services/view_manager/public/cpp/lib/view_observer.cc
deleted file mode 100644
index 7e6acc0c3f36c44f60294a0c65c350d2acd0561b..0000000000000000000000000000000000000000
--- a/mojo/services/view_manager/public/cpp/lib/view_observer.cc
+++ /dev/null
@@ -1,19 +0,0 @@
-// Copyright 2014 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.
-
-#include "view_manager/public/cpp/view_observer.h"
-
-namespace mojo {
-
-////////////////////////////////////////////////////////////////////////////////
-// ViewObserver, public:
-
-ViewObserver::TreeChangeParams::TreeChangeParams()
-    : target(nullptr),
-      old_parent(nullptr),
-      new_parent(nullptr),
-      receiver(nullptr) {
-}
-
-}  // namespace mojo