Remove module cache from ReactPackageTurboModuleManagerDelegate

Summary:
This cache is unnecessary, because:
1. TurboModuleManager caches all created TurboModules
2. TurboModuleManager calls into the TurboModuleManagerDelegate at most once per NativeModule `moduleName`.

This diff also makes ReactPackageTurboModuleManager thread-safe, which should help get rid of the crashes in T46487253.

Changelog: [Internal]

Reviewed By: mdvacca

Differential Revision: D21027998

fbshipit-source-id: c9b5ccc3da7b81787b749e70aa5e55883317eed7

ReactAndroid/src/main/java/com/facebook/react/turbomodule/core/ReactPackageTurboModuleManagerDelegate.java

@@ -18,13 +18,10 @@ import com.facebook.react.bridge.ReactApplicationContext;
 import com.facebook.react.module.model.ReactModuleInfo;
 import com.facebook.react.turbomodule.core.interfaces.TurboModule;
 import java.util.ArrayList;
-import java.util.HashMap;
 import java.util.List;
-import java.util.Map;
 
 public abstract class ReactPackageTurboModuleManagerDelegate extends TurboModuleManagerDelegate {
   private final List<TurboReactPackage> mPackages = new ArrayList<>();
-  private final Map<String, TurboModule> mModules = new HashMap<>();
   private final ReactApplicationContext mReactApplicationContext;
 
   protected ReactPackageTurboModuleManagerDelegate(
@@ -69,11 +66,8 @@ public abstract class ReactPackageTurboModuleManagerDelegate extends TurboModule
     return (CxxModuleWrapper) module;
   }
 
+  @Nullable
   private TurboModule resolveModule(String moduleName) {
-    if (mModules.containsKey(moduleName)) {
-      return mModules.get(moduleName);
-    }
-
     NativeModule resolvedModule = null;
 
     for (final TurboReactPackage pkg : mPackages) {
@@ -92,20 +86,10 @@ public abstract class ReactPackageTurboModuleManagerDelegate extends TurboModule
     }
 
     if (resolvedModule instanceof TurboModule) {
-      mModules.put(moduleName, (TurboModule) resolvedModule);
-    } else {
-      /**
-       * 1. The list of TurboReactPackages doesn't change. 2. TurboReactPackage.getModule is
-       * deterministic. Therefore, any two invocations of TurboReactPackage.getModule will return
-       * the same result given that they're provided the same arguments.
-       *
-       * <p>Hence, if module lookup fails once, we know it'll fail every time. Therefore, we can
-       * write null to the mModules Map and avoid doing this extra work.
-       */
-      mModules.put(moduleName, null);
+      return (TurboModule) resolvedModule;
     }
 
-    return mModules.get(moduleName);
+    return null;
   }
 
   @Override