Fixup SPIR-V include of builder

R=kainino@chromium.org, rharrison@chromium.org

Change-Id: I8ff30362a8a26705280510ff5d2867d634b4f483
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/33122
Auto-Submit: dan sinclair <dsinclair@chromium.org>
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
Commit-Queue: dan sinclair <dsinclair@chromium.org>
diff --git a/src/writer/spirv/test_helper.h b/src/writer/spirv/test_helper.h
index 46146e0..98637ba 100644
--- a/src/writer/spirv/test_helper.h
+++ b/src/writer/spirv/test_helper.h
@@ -23,7 +23,7 @@
 #include "src/ast/module.h"
 #include "src/context.h"
 #include "src/type_determiner.h"
-#include "src/writer/wgsl/generator_impl.h"
+#include "src/writer/spirv/builder.h"
 
 namespace tint {
 namespace writer {