Migrate RedBox to RCTBundleManager

Summary:
See title.

Changelog: [Internal]

Reviewed By: PeteTheHeat

Differential Revision: D28192003

fbshipit-source-id: a1a21782b51f327b9b92c60c7e9bd7251fcdebf0

React/CoreModules/RCTRedBox.mm

@@ -450,6 +450,7 @@ RCT_NOT_IMPLEMENTED(-(instancetype)initWithCoder : (NSCoder *)aDecoder)
 
 @synthesize bridge = _bridge;
 @synthesize moduleRegistry = _moduleRegistry;
+@synthesize bundleManager = _bundleManager;
 
 RCT_EXPORT_MODULE()
 
@@ -636,7 +637,7 @@ RCT_EXPORT_METHOD(dismiss)
 
 - (void)redBoxWindow:(__unused RCTRedBoxWindow *)redBoxWindow openStackFrameInEditor:(RCTJSStackFrame *)stackFrame
 {
-  NSURL *const bundleURL = _overrideBundleURL ?: _bridge.bundleURL;
+  NSURL *const bundleURL = _overrideBundleURL ?: _bundleManager.bundleURL;
   if (![bundleURL.scheme hasPrefix:@"http"]) {
     RCTLogWarn(@"Cannot open stack frame in editor because you're not connected to the packager.");
     return;