Remove spurious checks for sRGB float data

We don't support this. F16 or F32 textures must be built with a linear
transfer function, if any.

BUG=skia:

Change-Id: Ia8d83a03d12ddc3b70f5d7e4fabed72f6c2af538
Reviewed-on: https://skia-review.googlesource.com/6978
Reviewed-by: Robert Phillips <robertphillips@google.com>
Reviewed-by: Matt Sarett <msarett@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
1 file changed