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.h

@@ -61,11 +61,6 @@ class DeviceFeatures {
   void set_cast_receiver(bool is_cast_receiver) {
     cast_receiver = is_cast_receiver;
   }
-  // Generate a GTest filter of tests that should not be run. This should be
-  // called after Initialize.  Tests are filtered out based on which features
-  // are not supported.  For example, a device that uses Provisioning 3.0 will
-  // have all keybox tests filtered out.
-  std::string RestrictFilter(const std::string& initial_filter);
 
   // Get a list of output types that should be tested.
   const std::vector<OutputType>& GetOutputTypes();