Remove uninited pixel check from TexStorageWithPBO Towards the end of the test "TexStorageWithPBO" from Texture2DTest, the color of the pixel outside the red square is checked to confirm that it is black. However, due to that part being uninitialized in the test, its color could be left over from a prior test, causing a failure. * Removed the pixel check for outside the square. * Updated the color check for the square to cover its whole area. Bug: angleproject:4126 Bug: angleproject:5081 Bug: angleproject:5097 Bug: angleproject:5651 Bug: angleproject:8093 Change-Id: I3ceb8cf30456f51a60630f9e258210a8ccae0d95 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/4367898 Reviewed-by: Yuxin Hu <yuxinhu@google.com> Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>