webnn: Deprecate MLOperand members in favor of readonly attributes
As proposed in webmachinelearning/webnn#666
Bug: 365813262
Cq-Include-Trybots: luci.chromium.try:mac14-blink-rel,win11-blink-rel
Change-Id: I1fb29ee349ee527a574dc7e135200f8e774d709b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5975719
Auto-Submit: Austin Sullivan asully@chromium.org
Reviewed-by: ningxin hu ningxin.hu@intel.com
Commit-Queue: ningxin hu ningxin.hu@intel.com
Cr-Commit-Position: refs/heads/main@{#1375719}