This was done based on the incorrect assumption that Vulkan GLSL doesn't
allow layout qualifiers on interface block fields.  This was due to
glslang compile failures in some shaders that included mixed row- and
column-major fields in interface blocks.

However, the failures were only in the case the interface block is
inactive, in which case glslang wrapper previously replaced the
layout/qualifier of the interface block with |struct|, which left the
shader with an unused struct definition with fields that have layout
qualifiers; an invalid shader.

The change introduced in
https://chromium-review.googlesource.com/c/angle/angle/+/1951523
removes inactive shader interface declarations.  The above scenario thus
never occurs, rendering the row- to column-major transformation
unnecessary.

Bug: angleproject:3443
Change-Id: Ice34a0fc6e047b79a4d44f04b730ec59bdfafe33
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1961098Reviewed-by: Jonah Ryan-Davis <jonahr@google.com>
Reviewed-by: Cody Northrop <cnorthrop@google.com>
Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>