Reimplement automation API on top of C++-backed AXTree.

ui/accessibility/ax_tree_unittest.cc

Index: ui/accessibility/ax_tree_unittest.cc
diff --git a/ui/accessibility/ax_tree_unittest.cc b/ui/accessibility/ax_tree_unittest.cc
index 40aeeffd0dd8e04d78f11bb5e20113f37de76bfa..77ef8cda254adf7cd32749edc4b1aac5b59c6f5a 100644
--- a/ui/accessibility/ax_tree_unittest.cc
+++ b/ui/accessibility/ax_tree_unittest.cc
@@ -325,8 +325,8 @@ TEST(AXTreeTest, TreeDelegateIsCalled) {
   EXPECT_TRUE(tree.Unserialize(update));
 
   ASSERT_EQ(2U, fake_delegate.deleted_ids().size());
-  EXPECT_EQ(2, fake_delegate.deleted_ids()[0]);
-  EXPECT_EQ(1, fake_delegate.deleted_ids()[1]);
+  EXPECT_EQ(1, fake_delegate.deleted_ids()[0]);
+  EXPECT_EQ(2, fake_delegate.deleted_ids()[1]);
 
   ASSERT_EQ(1U, fake_delegate.subtree_deleted_ids().size());
   EXPECT_EQ(1, fake_delegate.subtree_deleted_ids()[0]);