Fix CMake build.

SpirvUtils.* are now in the dawn_native/opengl/ directory.

Bug: dawn:1067

Change-Id: I9cfb7ee52ec1f4ac321cb03978008843e33f82c6
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/61680
Reviewed-by: Austin Eng <enga@chromium.org>
Commit-Queue: Austin Eng <enga@chromium.org>
diff --git a/src/dawn_native/CMakeLists.txt b/src/dawn_native/CMakeLists.txt
index 3445757..d93e8a4 100644
--- a/src/dawn_native/CMakeLists.txt
+++ b/src/dawn_native/CMakeLists.txt
@@ -148,8 +148,6 @@
     "Sampler.h"
     "ShaderModule.cpp"
     "ShaderModule.h"
-    "SpirvUtils.cpp"
-    "SpirvUtils.h"
     "StagingBuffer.cpp"
     "StagingBuffer.h"
     "Subresource.cpp"
@@ -414,6 +412,8 @@
         "opengl/SamplerGL.h"
         "opengl/ShaderModuleGL.cpp"
         "opengl/ShaderModuleGL.h"
+        "opengl/SpirvUtils.cpp"
+        "opengl/SpirvUtils.h"
         "opengl/SwapChainGL.cpp"
         "opengl/SwapChainGL.h"
         "opengl/TextureGL.cpp"