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Many built-in exception types don't include some relevant information in their exceptions' [message] property, so this CL goes back to using [toString] to get string representations of exceptions. The unsightly exception prefixes are now removed via regular expression. R=rnystrom@google.com BUG= Review URL: https://codereview.chromium.org//140973006 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@32045 260f80e4-7a28-3924-810f-c04153c831b5