tint: Rename 'type' to 'alias'

Bug: tint:1812
Change-Id: I50bd8b036b47b4ec223a81eda53bd658d19645e9
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/117211
Kokoro: Kokoro <noreply+kokoro@google.com>
Reviewed-by: Dan Sinclair <dsinclair@chromium.org>
Commit-Queue: Ben Clayton <bclayton@google.com>
diff --git a/test/tint/shadowing/short_names/const.wgsl b/test/tint/shadowing/short_names/const.wgsl
index e1fb581..916c2b3 100644
--- a/test/tint/shadowing/short_names/const.wgsl
+++ b/test/tint/shadowing/short_names/const.wgsl
@@ -1,4 +1,4 @@
-type a = vec3f;
+alias a = vec3f;
 
 fn f() {
   {