Bug 1934638 [wpt PR 49470] - WebNN: Support AllowSharedBufferSource…

… for constant, a=testonly

Automatic update from web-platform-tests
WebNN: Support `AllowSharedBufferSource` for constant

This CL implements the WebNN spec change proposal [1] that uses
`AllowSharedBufferSource` for `MLGraphBuilder.constant()`.

[1]: webmachinelearning/webnn#790

Bug: 380896836
Change-Id: Ib8fc58daaabf7493b08f9634daa1eeb08a50ad35
Cq-Include-Trybots: luci.chromium.try​:win11-blink-rel, mac14.arm64-blink-rel, mac15.arm64-blink-rel, linux-blink-rel
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6050722
Reviewed-by: Austin Sullivan <asullychromium.org>
Reviewed-by: Weizhong Xia <weizhonggoogle.com>
Commit-Queue: ningxin hu <ningxin.huintel.com>
Cr-Commit-Position: refs/heads/main{#1390750}

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wpt-commits: 2643d924a518d89e3a8239ef92705bf1373504c9
wpt-pr: 49470

UltraBlame original commit: 25acfa3eb6954786eb5663d66876762a2a82eec9