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This CL makes the "capture_links": "new-client" web app manifest
setting behave like the existing experimental tabbed web app link
capturing.

This behavior is hidden behind the WebAppEnableLinkCapturing flag.

Screencast: https://bugs.chromium.org/p/chromium/issues/attachment?aid=484716&signed_aid=tplWTvCmrc2w7LVRH_JXdA==&inline=1

Bug: 1163398
Change-Id: I34c525bb35b09f25b2dfca3237d8baec9d5a1010
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2626618
Commit-Queue: Alan Cutter <alancutter@chromium.org>
Reviewed-by: Maggie Cai <mxcai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843908}