Clean listeners during destroy of ReactContext

Summary:
This diff cleans listeners on the destruction of the ReactContext.

changelog: [inernal] internal

Reviewed By: JoshuaGross

Differential Revision: D26259929

fbshipit-source-id: 1843cabdac2fa3e67dcc890afd923b82472d8f66

ReactAndroid/src/main/java/com/facebook/react/bridge/NativeModuleRegistry.java

@@ -8,6 +8,7 @@
 package com.facebook.react.bridge;
 
 import com.facebook.infer.annotation.Assertions;
+import com.facebook.react.config.ReactFeatureFlags;
 import com.facebook.react.module.annotations.ReactModule;
 import com.facebook.systrace.Systrace;
 import java.util.ArrayList;
@@ -84,7 +85,9 @@ public class NativeModuleRegistry {
       for (ModuleHolder module : mModules.values()) {
         module.destroy();
       }
-      mModules.clear();
+      if (ReactFeatureFlags.enableReactContextCleanupFix) {
+        mModules.clear();
+      }
     } finally {
       Systrace.endSection(Systrace.TRACE_TAG_REACT_JAVA_BRIDGE);
     }