[shuffle] Rename SpvGeneratorImplTest

Renamed to SpirvWriterTest to match the new file names.

Bug: tint:1988
Change-Id: I97cfd8fe0ab11d3769eaa13d83ea0972af01ac53
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/142301
Kokoro: Kokoro <noreply+kokoro@google.com>
Reviewed-by: Dan Sinclair <dsinclair@chromium.org>
Auto-Submit: James Price <jrprice@google.com>
Commit-Queue: James Price <jrprice@google.com>
diff --git a/src/tint/lang/spirv/writer/test_helper.h b/src/tint/lang/spirv/writer/test_helper.h
index 5d82c33..be4f711 100644
--- a/src/tint/lang/spirv/writer/test_helper.h
+++ b/src/tint/lang/spirv/writer/test_helper.h
@@ -64,9 +64,9 @@
 
 /// Base helper class for testing the SPIR-V generator implementation.
 template <typename BASE>
-class SpvGeneratorTestHelperBase : public BASE {
+class SpirvWriterTestHelperBase : public BASE {
   public:
-    SpvGeneratorTestHelperBase() : generator_(&mod, false) {}
+    SpirvWriterTestHelperBase() : generator_(&mod, false) {}
 
     /// The test module.
     ir::Module mod;
@@ -229,10 +229,10 @@
     }
 };
 
-using SpvGeneratorImplTest = SpvGeneratorTestHelperBase<testing::Test>;
+using SpirvWriterTest = SpirvWriterTestHelperBase<testing::Test>;
 
 template <typename T>
-using SpvGeneratorImplTestWithParam = SpvGeneratorTestHelperBase<testing::TestWithParam<T>>;
+using SpirvWriterTestWithParam = SpirvWriterTestHelperBase<testing::TestWithParam<T>>;
 
 }  // namespace tint::writer::spirv