webgpu.h: bundlesCount -> bundleCount

This is a noop change because it just renames a function
argument in dawn.json. All other places for that argument
already used bundleCount so no additional changes are needed.

Bug: None
Change-Id: Id3d77d61886b470beede8229cc079905682c3525
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/104362
Commit-Queue: Kai Ninomiya <kainino@chromium.org>
Kokoro: Kokoro <noreply+kokoro@google.com>
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
Auto-Submit: Corentin Wallez <cwallez@chromium.org>
diff --git a/dawn.json b/dawn.json
index 1080426..2bcd047 100644
--- a/dawn.json
+++ b/dawn.json
@@ -1977,8 +1977,8 @@
             {
               "name": "execute bundles",
               "args": [
-                  {"name": "bundles count", "type": "uint32_t"},
-                  {"name": "bundles", "type": "render bundle", "annotation": "const*", "length": "bundles count"}
+                  {"name": "bundle count", "type": "uint32_t"},
+                  {"name": "bundles", "type": "render bundle", "annotation": "const*", "length": "bundle count"}
               ]
             },
             {