Revert of Add gl tests to make sure when a buffer is unmapped, all access path generates an ...

gpu/command_buffer/service/transform_feedback_manager.cc

Index: gpu/command_buffer/service/transform_feedback_manager.cc
diff --git a/gpu/command_buffer/service/transform_feedback_manager.cc b/gpu/command_buffer/service/transform_feedback_manager.cc
index 0c04fcd7749873aae4e7a90139175ccf1dc84829..e474c0bc07baf69eb65dac5056ac713f9ecbeee8 100644
--- a/gpu/command_buffer/service/transform_feedback_manager.cc
+++ b/gpu/command_buffer/service/transform_feedback_manager.cc
@@ -114,5 +114,12 @@
   }
 }
 
+void TransformFeedbackManager::RemoveBoundBuffer(Buffer* buffer) {
+  for (auto iter = transform_feedbacks_.begin();
+       iter != transform_feedbacks_.end(); ++iter) {
+    iter->second->RemoveBoundBuffer(buffer);
+  }
+}
+
 }  // namespace gles2
 }  // namespace gpu