Remove experimental shouldBridgeInitializeNativeModulesSynchronously:

Differential Revision: D6124035

fbshipit-source-id: 540b8bfc955bf48e9ca33ed97807177ac740059e

React/Base/RCTBatchedBridge.mm

@@ -410,8 +410,6 @@ RCT_NOT_IMPLEMENTED(- (instancetype)initWithBundleURL:(__unused NSURL *)bundleUR
     // We better be on the right thread too.
     RCTAssertMainQueue();
     initializeImmediately = YES;
-  } else if ([self.delegate respondsToSelector:@selector(shouldBridgeInitializeNativeModulesSynchronously:)]) {
-    initializeImmediately = [self.delegate shouldBridgeInitializeNativeModulesSynchronously:self];
   }
 
   // Set up modules that require main thread init or constants export

React/Base/RCTBridgeDelegate.h

@@ -63,16 +63,6 @@
  */
 - (BOOL)shouldBridgeLoadJavaScriptSynchronously:(RCTBridge *)bridge;
 
-/**
- * When initializing native modules that require main thread initialization, the bridge
- * will default to dispatch module creation blocks asynchrously. If we're blockingly
- * waiting on the main thread to finish bridge creation on the main thread, this will
- * deadlock. Override this method to initialize modules synchronously instead.
- *
- * @experimental
- */
-- (BOOL)shouldBridgeInitializeNativeModulesSynchronously:(RCTBridge *)bridge;
-
 /**
  * Configure whether the JSCExecutor created should use the system JSC API or
  * alternative hooks provided. When returning YES from this method, you must have

React/CxxBridge/RCTCxxBridge.mm

@@ -725,8 +725,6 @@ struct RCTInstanceCallback : public InstanceCallback {
     // We better be on the right thread too.
     RCTAssertMainQueue();
     initializeImmediately = YES;
-  } else if ([self.delegate respondsToSelector:@selector(shouldBridgeInitializeNativeModulesSynchronously:)]) {
-    initializeImmediately = [self.delegate shouldBridgeInitializeNativeModulesSynchronously:self];
   }
 
   // Set up modules that require main thread init or constants export