Move setDefaults call to constructor.

Reviewed By: javache

Differential Revision: D3514703

fbshipit-source-id: 8195778b23868eae36a55edc2d5d4f148b36a12e

Author: nathanajah

React/Base/RCTBundleURLProvider.m

@@ -32,18 +32,22 @@ + (void)initialize
 }
 #endif
 
+- (instancetype)init
+{
+  self = [super init];
+  if (self) {
+    [self setDefaults];
+  }
+  return self;
+}
+
 - (NSDictionary *)defaults
 {
-  static NSDictionary *defaults;
-  static dispatch_once_t onceToken;
-  dispatch_once(&onceToken, ^{
-    defaults = @{
-      kRCTEnableLiveReloadKey: @NO,
-      kRCTEnableDevKey: @YES,
-      kRCTEnableMinificationKey: @NO,
-     };
-  });
-  return defaults;
+  return @{
+    kRCTEnableLiveReloadKey: @NO,
+    kRCTEnableDevKey: @YES,
+    kRCTEnableMinificationKey: @NO,
+  };
 }
 
 - (void)settingsUpdated

local-cli/generator-ios/templates/app/AppDelegate.m

@@ -18,7 +18,6 @@ - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(
 {
   NSURL *jsCodeLocation;
 
-  [[RCTBundleURLProvider sharedSettings] setDefaults];
   jsCodeLocation = [[RCTBundleURLProvider sharedSettings] jsBundleURLForBundleRoot:@"index.ios" fallbackResource:nil];
 
   RCTRootView *rootView = [[RCTRootView alloc] initWithBundleURL:jsCodeLocation