[Cleanup] Don't try to load obsolete touch resources.
 Touch UI has been removed long time ago, and this CL removes
the code that used to load resources for Touch UI.

 I'll remove the assets in separate CL.

BUG=none
R=girard@chromium.org

Review URL: https://codereview.chromium.org/133053002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@244314 0039d316-1c4b-4281-b951-d872f2087c98
linux_aura: Fix dragging files into Dropbox.

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
SVN changes up to revision 244315