Move initialization of RCTBatchedBridge into its own method.

Summary: This makes room for local development without touching OSS code.

Reviewed By: tadeuzagallo

Differential Revision: D2986122

fb-gh-sync-id: 2f23088a078b0f0fb4b74946490fd5b67b01c0ac
shipit-source-id: 2f23088a078b0f0fb4b74946490fd5b67b01c0ac

Author: mhorowitz

React/Base/RCTBridge.m

@@ -268,6 +268,11 @@ - (void)setUp
   // Sanitize the bundle URL
   _bundleURL = [RCTConvert NSURL:_bundleURL.absoluteString];
 
+  [self createBatchedBridge];
+}
+
+- (void)createBatchedBridge
+{
   self.batchedBridge = [[RCTBatchedBridge alloc] initWithParentBridge:self];
 }
 
@@ -288,7 +293,7 @@ - (BOOL)isBatchActive
 
 - (void)invalidate
 {
-  RCTBatchedBridge *batchedBridge = (RCTBatchedBridge *)self.batchedBridge;
+  RCTBridge *batchedBridge = self.batchedBridge;
   self.batchedBridge = nil;
 
   if (batchedBridge) {