Remove CreateGpuMemoryBufferFromClientId and plumbing

cc/ipc/transferable_resource_struct_traits.h

Index: cc/ipc/transferable_resource_struct_traits.h
diff --git a/cc/ipc/transferable_resource_struct_traits.h b/cc/ipc/transferable_resource_struct_traits.h
index e5a269c6159e5d6ecb418c3c7ecc08c06c597960..940521daf9374d688a7c33091fd71e7d11ae2e91 100644
--- a/cc/ipc/transferable_resource_struct_traits.h
+++ b/cc/ipc/transferable_resource_struct_traits.h
@@ -43,11 +43,6 @@ struct StructTraits<cc::mojom::TransferableResource, cc::TransferableResource> {
     return resource.is_software;
   }
 
-  static int32_t gpu_memory_buffer_id(
-      const cc::TransferableResource& resource) {
-    return resource.gpu_memory_buffer_id.id;
-  }
-
   static bool is_overlay_candidate(const cc::TransferableResource& resource) {
     return resource.is_overlay_candidate;
   }
@@ -62,7 +57,6 @@ struct StructTraits<cc::mojom::TransferableResource, cc::TransferableResource> {
     out->filter = data.filter();
     out->read_lock_fences_enabled = data.read_lock_fences_enabled();
     out->is_software = data.is_software();
-    out->gpu_memory_buffer_id.id = data.gpu_memory_buffer_id();
     out->is_overlay_candidate = data.is_overlay_candidate();
     return true;
   }