Expect failure on license load for expired LDL license

Merge from Widevine repo of http://go/wvgerrit/170970

RenewOnLicenseLoad.Case2 tests are failing because they
are expecting to load an expired license. However, the spec
says that the license should return KEY_EXPIRED. The test is
being updated.

Some other RenewOnLicenseLoad tests were failing because
they forgot to request the renewal.

Bug: 278750980
Test: Run tests on Luci
Change-Id: I7196db11fcf43859ba9310b87fd8ccb609e47039

libwvdrmengine/cdm/core/test/license_holder.h

@@ -59,6 +59,9 @@ class LicenseHolder {
   // Load the license response into the CDM engine. A call to FetchLicense()
   // must be made first.
   void LoadLicense();
+  // Attempt to load the license response into the CDM engine, but expect a
+  // failure.
+  void FailLoadLicense();
   // Reload the license. Call OpenSession() before calling
   // ReloadLicense(). Also, the key_set_id must have been set previously. The
   // key_set_id is set by calling LoadLicense(), or by calling set_key_set_id().