IWYU: include string.h for memcpy

Bug: None
Change-Id: I978f49febf7e9e9e961957f62efd3ff9a166b81b
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/35001
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>

src/dawn_wire/ChunkedCommandHandler.cpp

@@ -16,6 +16,8 @@
 
 #include <algorithm>
 
+#include <string.h>
+
 namespace dawn_wire {
 
     ChunkedCommandHandler::~ChunkedCommandHandler() = default;