Fix AgentIdentityUtilsTest compilation after checkstyle

Author: macastelaz

google-auth-library-java/oauth2_http/javatests/com/google/auth/oauth2/AgentIdentityUtilsTest.java

@@ -180,7 +180,7 @@ public void getAgentIdentityCertificate_happyPath_loadsCertificate() throws IOEx
     envProvider.setEnv("GOOGLE_API_CERTIFICATE_CONFIG", configFile.getAbsolutePath());
     AgentIdentityUtils.CertInfo info = AgentIdentityUtils.getAgentIdentityCertInfo();
     assertNotNull(info);
-    assertTrue(info.certificate.getIssuerDN().getName().contains("unit-tests"));
+    assertTrue(info.getCertificate().getIssuerDN().getName().contains("unit-tests"));
   }
 
   @Test
@@ -256,7 +256,7 @@ public void getAgentIdentityCertInfo_fallbackPath_loadsCertificate() throws IOEx
     assertNotNull(info);
     assertEquals(
         new String(Files.readAllBytes(tempDir.resolve("certificates.pem")), StandardCharsets.UTF_8),
-        info.certContent);
+        info.getCertContent());
   }
 
   @Test