Make ComboRenderPipelineDescriptor non copyable.

This causes subtle bugs in tests when pointers in combo render pipeline
descriptors point at other combo render pipeline descriptors.

BUG=dawn:22

Change-Id: I5234df26895986fd1d7a9b4e835598177581803a
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/11340
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Austin Eng <enga@chromium.org>
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
diff --git a/src/utils/ComboRenderPipelineDescriptor.h b/src/utils/ComboRenderPipelineDescriptor.h
index 31f34a5..a0a921e 100644
--- a/src/utils/ComboRenderPipelineDescriptor.h
+++ b/src/utils/ComboRenderPipelineDescriptor.h
@@ -35,6 +35,11 @@
       public:
         ComboRenderPipelineDescriptor(const dawn::Device& device);
 
+        ComboRenderPipelineDescriptor(const ComboRenderPipelineDescriptor&) = delete;
+        ComboRenderPipelineDescriptor& operator=(const ComboRenderPipelineDescriptor&) = delete;
+        ComboRenderPipelineDescriptor(ComboRenderPipelineDescriptor&&) = delete;
+        ComboRenderPipelineDescriptor& operator=(ComboRenderPipelineDescriptor&&) = delete;
+
         dawn::PipelineStageDescriptor cFragmentStage;
 
         ComboVertexInputDescriptor cVertexInput;