dawn/node: Update for latest WebGPU IDL

Most new APIs have just been stubbed with `UNIMPLEMENTED()`.
We'll need to flesh these out. This unblocks the Tint team for now though.

Bug: dawn:1123
Change-Id: I484559278a21e187ba496e01401316ac91be7d26
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/92941
Commit-Queue: Ben Clayton <bclayton@google.com>
Reviewed-by: Austin Eng <enga@chromium.org>

DEPS

diff --git a/DEPS b/DEPS
index 6159c7a..ee3831b 100644
--- a/DEPS
+++ b/DEPS
@@ -169,7 +169,7 @@
     'condition': 'dawn_node',
   },
   'third_party/gpuweb': {
-    'url': '{github_git}/gpuweb/gpuweb.git@16df823c91c9045b7cdf9bd0f2c0ef6d43ac95e7',
+    'url': '{github_git}/gpuweb/gpuweb.git@3c4734b09c68eb800b15da5e9ecefeca735fa7df',
     'condition': 'dawn_node',
   },