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Currently, when a caller requests a desktop tree and then opens a new windowthe new WebViewmight have an unloaded child root web area because the tree id sent on construction may be stale by the time automation gets it. Adding a notification in WebView::RenderViewHostChanged appears to work properly.

This also allows ChromeVox to add one set of listeners on the desktop node.

TEST=With ChromeVox Next set to use automation,
- navigate within a tab
- switch to several tabs and navigate
- open new windows and navigate
Result should be that events fire properly when tabbing within the new page.

Review URL: https://codereview.chromium.org/880063002

Cr-Commit-Position: refs/heads/master@{#314017}