Fix expiry time overflow if it is unlimited

Bug: 21324836

Merged from Widevine CDM repo:
https://widevine-internal-review.googlesource.com/#/c/14392

Change-Id: I2a8da14c98f8ae0fece3667b6f6b8517577f8a98

libwvdrmengine/cdm/test/request_license_test.cpp

@@ -495,8 +495,8 @@ class TestWvCdmEventListener : public WvCdmEventListener {
   MOCK_METHOD3(OnSessionKeysChange, void(const CdmSessionId& session_id,
                                          const CdmKeyStatusMap& keys_status,
                                          bool has_new_usable_key));
-  MOCK_METHOD2(OnExpirationUpdate,
-               void(const CdmSessionId& session_id, int64_t new_expiry_time));
+  MOCK_METHOD2(OnExpirationUpdate, void(const CdmSessionId& session_id,
+                                        int64_t new_expiry_time_seconds));
 };
 
 class WvCdmRequestLicenseTest : public WvCdmTestBase {