Small refactoring changes

1) Move some provisioning unit tests into
   oemcrypto_provisioning_test.cpp
2) Remove some test group comments

Bug: 253779846
Merged from https://widevine-internal-review.googlesource.com/176735

Change-Id: I3d02c23b63eb7949fbc6abf60a7dbe32086ef2c9

libwvdrmengine/oemcrypto/test/oemcrypto_provisioning_test.h

@@ -142,6 +142,31 @@ class OEMCryptoLoadsCertificate : public OEMCryptoSessionTestKeyboxTest {
   }
 };
 
+// These tests are run by all L1 devices that load and use certificates.  It is
+// also run by a few L3 devices that use a baked in certificate, but cannot load
+// a certificate.
+class OEMCryptoUsesCertificate : public OEMCryptoLoadsCertificate {
+ protected:
+  void SetUp() override {
+    OEMCryptoLoadsCertificate::SetUp();
+    ASSERT_NO_FATAL_FAILURE(session_.open());
+    if (global_features.derive_key_method ==
+        DeviceFeatures::LOAD_TEST_RSA_KEY) {
+      ASSERT_NO_FATAL_FAILURE(session_.SetRsaPublicKeyFromPrivateKeyInfo(
+          encoded_rsa_key_.data(), encoded_rsa_key_.size()));
+    } else {
+      InstallTestDrmKey(&session_);
+    }
+  }
+
+  void TearDown() override {
+    ASSERT_NO_FATAL_FAILURE(session_.close());
+    OEMCryptoLoadsCertificate::TearDown();
+  }
+
+  Session session_;
+};
+
 }  // namespace wvoec
 
 #endif  // CDM_OEMCRYPTO_PROVISIONING_TEST_