Add a backward compatible option to goog.debug.ErrorHandler to not wrap
exceptions before re-throwing. This makes errors in the console of Chrome
Dev Tools and other browsers show up like expected with the correct
message, filename, line number and stack trace (welcome to 2013 :).

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Created by MOE: http://code.google.com/p/moe-java
MOE_MIGRATED_REVID=42929501