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Find the OSDD(Open Search Description Document) <link> in web pages and
return it's URL. This is one of methods that recognize a web page as
a search engine.

Bug: 433824
Cq-Include-Trybots: luci.chromium.try:ios-simulator-cronet;luci.chromium.try:ios-simulator-full-configs
Change-Id: I2c6d31bf48a9de4aedfe884147e55150c0ee23b9
Reviewed-on: https://chromium-review.googlesource.com/c/1290934
Commit-Queue: Yi Su <mrsuyi@chromium.org>
Reviewed-by: Mark Cogan <marq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#601150}