When the duplicate infobar pops up, it asks "Do you want to download %URL again?".  If %URL is large, it will elide by inserting an ellipsis in the middle.  Unfortunately, scammers can use this to obscure the true domain of a page.

Existing utilities for securely eliding a URL don't exist on Android.

The security impact of this is limited because elsewhere in the UI we display the true origin of download.

Split off from Issue 657341
 

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