These classes were only used to implement checked loads.

Bug: 
Change-Id: Icd3aa6f22ffe7a48e5bea98b0a44a58905788c80
Reviewed-on: https://chromium-review.googlesource.com/847578Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Commit-Queue: Pierre Langlois <pierre.langlois@arm.com>
Cr-Commit-Position: refs/heads/master@{#50328}