Revert of Add fuzzer for AXTree and fix a couple of bugs it found.

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 5e8bdcd232106edf5ded355f162dfcda744848ba..78765beaa0721cea5b530fb961eebd078f1bdb59 100644
--- a/ui/accessibility/ax_tree_unittest.cc
+++ b/ui/accessibility/ax_tree_unittest.cc
@@ -479,33 +479,4 @@
   tree.SetDelegate(NULL);
 }
 
-// UAF caught by ax_tree_fuzzer
-TEST(AXTreeTest, BogusAXTree) {
-  AXTreeUpdate initial_state;
-  AXNodeData node;
-  node.id = 0;
-  node.state = 0;
-  initial_state.nodes.push_back(node);
-  initial_state.nodes.push_back(node);
-  ui::AXTree tree;
-  tree.Unserialize(initial_state);
-}
-
-// UAF caught by ax_tree_fuzzer
-TEST(AXTreeTest, BogusAXTree2) {
-  AXTreeUpdate initial_state;
-  AXNodeData node;
-  node.id = 0;
-  node.state = 0;
-  initial_state.nodes.push_back(node);
-  AXNodeData node2;
-  node2.id = 0;
-  node2.state = 0;
-  node2.child_ids.push_back(0);
-  node2.child_ids.push_back(0);
-  initial_state.nodes.push_back(node2);
-  ui::AXTree tree;
-  tree.Unserialize(initial_state);
-}
-
 }  // namespace ui