Removes the content handler registration for the application class and any bindings made during registration to the content ID, type(s), suffix(es), and action(s), etc. Only content handlers registered either statically or dynamically in the current application package will be removed.
@param classname the name of the content handler class
@return true if the content handler registeredby this application was found and removed; false otherwise
@exception NullPointerException if classname isnull
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