webnn: Update idlharness test to create a valid graph
The existing test includes use of an MLActivation with conv2d() for op
fusion, which is no longer supported
Also fixes the expectation that NavigatorML will be visible from script
Change-Id: I5475f86c81c83a927ff358118d88bd3f1e9ae535
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5608972
Reviewed-by: Phillis Tang phillis@chromium.org
Auto-Submit: Austin Sullivan asully@chromium.org
Commit-Queue: Phillis Tang phillis@chromium.org
Cr-Commit-Position: refs/heads/main@{#1312892}