Fix dawn_native/CMakeLists by removing commas

TBR=bajones@chromium.org
Bug: dawn:746
Change-Id: Iec075f2d75ca254d401e089f85d33e814a89adf3
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/46861
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
diff --git a/src/dawn_native/CMakeLists.txt b/src/dawn_native/CMakeLists.txt
index ab80577..ba6cec9 100644
--- a/src/dawn_native/CMakeLists.txt
+++ b/src/dawn_native/CMakeLists.txt
@@ -62,8 +62,8 @@
     "CommandValidation.h"
     "Commands.cpp"
     "Commands.h"
-    "CompilationMessages.cpp",
-    "CompilationMessages.h",
+    "CompilationMessages.cpp"
+    "CompilationMessages.h"
     "ComputePassEncoder.cpp"
     "ComputePassEncoder.h"
     "ComputePipeline.cpp"