TextInput setSelection method was moved to base class

Summary: This method was identical between two subclasses, so it was moved to baseclass.

Reviewed By: javache

Differential Revision: D5297401

fbshipit-source-id: 8f56bef33f9ab0184f69da76177b5e8da10d7514

Libraries/Text/RCTTextField.m

@@ -27,9 +27,7 @@
 @implementation RCTTextField
 {
   RCTUITextField *_backedTextInput;
-  NSInteger _nativeEventCount;
   BOOL _submitted;
-  UITextRange *_previousSelectionRange;
   NSString *_finalText;
   CGSize _previousContentSize;
 }
@@ -71,26 +69,6 @@ RCT_NOT_IMPLEMENTED(- (instancetype)initWithCoder:(NSCoder *)aDecoder)
 
 #pragma mark - Properties
 
-- (void)setSelection:(RCTTextSelection *)selection
-{
-  if (!selection) {
-    return;
-  }
-
-  UITextRange *currentSelection = _backedTextInput.selectedTextRange;
-  UITextPosition *start = [_backedTextInput positionFromPosition:_backedTextInput.beginningOfDocument offset:selection.start];
-  UITextPosition *end = [_backedTextInput positionFromPosition:_backedTextInput.beginningOfDocument offset:selection.end];
-  UITextRange *selectedTextRange = [_backedTextInput textRangeFromPosition:start toPosition:end];
-
-  NSInteger eventLag = _nativeEventCount - _mostRecentEventCount;
-  if (eventLag == 0 && ![currentSelection isEqual:selectedTextRange]) {
-    _previousSelectionRange = selectedTextRange;
-    _backedTextInput.selectedTextRange = selectedTextRange;
-  } else if (eventLag > RCTTextUpdateLagWarningThreshold) {
-    RCTLogWarn(@"Native TextInput(%@) is %zd events ahead of JS - try to make your JS faster.", self.text, eventLag);
-  }
-}
-
 - (NSString *)text
 {
   return _backedTextInput.text;