Make RCTUIManager and RCTDeviceInfo unsubscribe from NSNotificationCenter on

Reviewed By: fromcelticpark

Differential Revision: D5986167

fbshipit-source-id: 18131572361c4b3f5e0ed5c8f97833a21902cad1

React/Modules/RCTDeviceInfo.m

@@ -86,6 +86,11 @@ static NSDictionary *RCTExportedDimensions(RCTBridge *bridge)
            };
 }
 
+- (void)dealloc
+{
+  [NSNotificationCenter.defaultCenter removeObserver:self];
+}
+
 - (void)invalidate
 {
   RCTExecuteOnMainQueue(^{

React/Modules/RCTUIManager.m

@@ -79,6 +79,11 @@ RCT_EXPORT_MODULE()
   return NO;
 }
 
+- (void)dealloc
+{
+  [NSNotificationCenter.defaultCenter removeObserver:self];
+}
+
 - (void)invalidate
 {
   /**