Undo renaming of flag to enable testing options

Change-Id: I4a0fe78858ba3c8b2f052e26583d0788ece09e1b
diff --git a/src/main/java/com/android/tools/r8/shaking/ProguardConfigurationParserOptions.java b/src/main/java/com/android/tools/r8/shaking/ProguardConfigurationParserOptions.java
index 9b9336f..53540d2 100644
--- a/src/main/java/com/android/tools/r8/shaking/ProguardConfigurationParserOptions.java
+++ b/src/main/java/com/android/tools/r8/shaking/ProguardConfigurationParserOptions.java
@@ -39,7 +39,7 @@
           parseSystemPropertyOrDefault(
               "com.android.tools.r8.experimental.enablewhyareyounotinlining", false);
       enableTestingOptions =
-          parseSystemPropertyOrDefault("com.android.tools.r8.allowTestingOptions", false);
+          parseSystemPropertyOrDefault("com.android.tools.r8.allowTestProguardOptions", false);
       return this;
     }