Fix for gtest missing core classes, attempt 2

common_runtime_test loads both core-libart and
core-oj

Change-Id: I8a4d5750b99aed2e500cad89b841a57fe9c1ca69
diff --git a/runtime/common_runtime_test.h b/runtime/common_runtime_test.h
index c19b30f..2af8208 100644
--- a/runtime/common_runtime_test.h
+++ b/runtime/common_runtime_test.h
@@ -92,8 +92,8 @@
 
   virtual void TearDown();
 
-  // Gets the path of the libcore dex file.
-  std::string GetLibCoreDexFileName();
+  // Gets the paths of the libcore dex files.
+  std::vector<std::string> GetLibCoreDexFileNames();
 
   // Gets the path of the specified dex file for host or target.
   std::string GetDexFileName(const std::string& jar_prefix);