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Before, the compiler raised an exception when a function was used as a property,
which happens whenever a function is passed as a parameter.

The solution presented here is to create a bool has_<function_name> to allow
the hand-written C++ code to know whether or not the function was passed in.

BUG=138850
TEST=function_as_parameter


Review URL: https://chromiumcodereview.appspot.com/10824002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@148480 0039d316-1c4b-4281-b951-d872f2087c98