Removed SizedFloat helper class from upload tests. This helper was redundant with the image utils library. Switch the test to use the existing methods. Doesn't affect test correctness. This removes more 'configless' tests from angle_end2end_tests. Bug: angleproject:3393 Change-Id: I49cfbd95c3713b2b4b25c4716a7a279d84ddf994 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1591426 Reviewed-by: Geoff Lang <geofflang@chromium.org> Commit-Queue: Jamie Madill <jmadill@chromium.org>