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As Dart C++ code cannot use C++ exceptions make sure that the C++ libraries on Windows does not try to use C++ exceptions. This gets rid of the warning warning C4530: C++ exception handler used, but unwind semantics are not enabled. Specify /EHsc when compiling on Windows. R=iposva@google.com Review URL: https://chromiumcodereview.appspot.com//10837047 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@10167 260f80e4-7a28-3924-810f-c04153c831b5