[Chat] remove old workaround for render glitches

Xamarin.iOS 8.10.1.24

Chat/Chat/ChatInput/ChatInputView.cs

@@ -25,9 +25,6 @@ namespace Chat
 		public ChatInputView ()
 		{
 			TextView = new UITextView ();
-			TextView.Changed += OnTextChanged;
-			TextView.Started += OnTextChanged;
-			TextView.Ended += OnTextChanged;
 			TextView.Layer.BorderColor = InputBorderColor.CGColor;
 			TextView.Layer.BorderWidth = BorderWidth;
 			TextView.Layer.CornerRadius = CornerRadius;
@@ -68,10 +65,5 @@ namespace Chat
 			AddConstraints (c1);
 			AddConstraint (c2);
 		}
-
-		void OnTextChanged (object sender, EventArgs e)
-		{
-			SetNeedsDisplay ();
-		}
 	}
 }