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Core library stack frames now have libraries and meaningful line numbers, so in general we should preserve those. However, terse stack traces don't care about the internal workings of the core libraries, so they now explicitly remove the library and line number information. R=rnystrom@google.com Review URL: https://codereview.chromium.org//16097012 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@23621 260f80e4-7a28-3924-810f-c04153c831b5