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The default HWND provider for UI Automation will generate a runtime id
for our fragment root, but relying on this behavior for the legacy
window was breaking the Inspect tool's ability to expand the tree for
web content. Removing the special case and generating a runtime id for
the fragment root as for any other node fixes the issue.

Bug: 928811
Change-Id: Id15d33cacbc97699e904e9bf53e1b39975cbf8a5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1797096Reviewed-by: Kurt Catti-Schmidt <kschmi@microsoft.com>
Commit-Queue: Kevin Babbitt <kbabbitt@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#695812}