Revert "Update PrimitiveTopologyTests to use WGSL"

This reverts commit b9641b8225.

Reason for revert: Suspect causing Dawn roll to fail

Original change's description:
> Update PrimitiveTopologyTests to use WGSL
>
> A rebased fork of https://dawn-review.googlesource.com/c/dawn/+/33774
>
> Bug: dawn:572
> Change-Id: Icb24ac5b62984e9b093e61077155b9a1eafb344b
> Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/35801
> Commit-Queue: Ben Clayton <bclayton@google.com>
> Auto-Submit: Ben Clayton <bclayton@google.com>
> Reviewed-by: Austin Eng <enga@chromium.org>
> Reviewed-by: Corentin Wallez <cwallez@chromium.org>

TBR=cwallez@chromium.org,enga@chromium.org,bclayton@google.com

Change-Id: Ib6fe527f28cf17f8f8e817c59121e357b9b65cd1
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: dawn:572
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/36520
Reviewed-by: Austin Eng <enga@chromium.org>
Commit-Queue: Austin Eng <enga@chromium.org>

src/tests/end2end/PrimitiveTopologyTests.cpp

@@ -151,6 +151,9 @@ class PrimitiveTopologyTest : public DawnTest {
     void SetUp() override {
         DawnTest::SetUp();
 
+        // TODO(crbug.com/tint/398): GLSL builtins don't work with SPIR-V reader.
+        DAWN_SKIP_TEST_IF(HasToggleEnabled("use_tint_generator"));
+
         renderPass = utils::CreateBasicRenderPass(device, kRTSize, kRTSize);
 
         vsModule = utils::CreateShaderModuleFromWGSL(device, R"(