Remove RestrictFilter() function and RSAPerformance test

Since we want to migrate to using GTEST_SKIP to skip unit tests instead
of GTEST_FILTER, we can remove the RestrictFilter() function which
filters the tests out using GTEST_FILTER. To do this, the RSAPerformance
test needs to be removed, which is acceptable since no one uses this
test anymore. However, b/299135804 is being used to track a new way to
either execute/track permance.

Bug: 251240681, 299135804
Change-Id: Ife59c468ee127f4c39d3be91707ca38a061b7895

libwvdrmengine/oemcrypto/test/oec_device_features.cpp

@@ -145,17 +145,6 @@ void DeviceFeatures::Initialize() {
   initialized_ = true;
 }
 
-std::string DeviceFeatures::RestrictFilter(const std::string& initial_filter) {
-  std::string filter = initial_filter;
-  // Performance tests take a long time.  Filter them out if they are not
-  // specifically requested.
-  if (filter.find("Performance") == std::string::npos) {
-    FilterOut(&filter, "*Performance*");
-  }
-
-  return filter;
-}
-
 void DeviceFeatures::PickDerivedKey() {
   switch (provisioning_method) {
     case OEMCrypto_OEMCertificate: