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Some Linux file managers will set both URI list representation and the
plain text representation when dragging files. Chrome interprets this as
a chunk of text and a file, and offers both to the renderer. This broke
the javascript on the Dropbox website.

This ports the hack in WebDragDestGtk::OnDragDataReceived() to
linux_aura. This hack prevents us from offering the String type when we
also have a URI list.

BUG=318796

Review URL: https://codereview.chromium.org/133053003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@244315 0039d316-1c4b-4281-b951-d872f2087c98