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You'll need to modify the WEB-INF/spring-configuration/argumentExtractorsConfiguration.xml, and add the following:
(note: the section  p:httpClient-ref="httpClient"   is only for 3.4 and up, and should be removed for 3.3.x)

<bean
        name="googleAccountsArgumentExtractor"
	class="org.jasig.cas.web.support.GoogleAccountsArgumentExtractor"
	p:privateKey-ref="privateKeyFactoryBean"
	p:publicKey-ref="publicKeyFactoryBean"
        p:httpClient-ref="httpClient" />

Reference that from the list of ArgumentExtractors, so it would look something like this:

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