Clean up generated object_tracker.h This file was generated on the trybots dry-running a change that rolls the vulkan repos [1]. This is causing a build failure on other CLs. [1] https://chromium-review.googlesource.com/c/angle/angle/+/1405714 Bug: 925077 Change-Id: I3101a4a3fdeb7c38ac5cfe6a1d621e03a9f49071 Reviewed-on: https://chromium-review.googlesource.com/c/1435154 Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: Yuly Novikov <ynovikov@chromium.org>