Vulkan: Pass RendererVk to BufferHelper::destroy. Bug: angleproject:2162 Change-Id: I7c0090d48b0a5bac222b1edf4c2db280d5b32930 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2139993 Commit-Queue: Jamie Madill <jmadill@chromium.org> Reviewed-by: Mohan Maiya <m.maiya@samsung.com> Reviewed-by: Courtney Goeltzenleuchter <courtneygo@google.com>