Remove isTextNode optimization

Summary: Scrolling through feed and logging when this optimization is hit leads to... 0 logs. If anything this just adds to confusion. It was initially added due to instinct and not data, which was a mistake. I am happy to add some similar optimization in the future if we have data that it is useful in real world situations, currently it just leads to bugs and confusion though.

Reviewed By: astreet

Differential Revision: D4146785

fbshipit-source-id: e20d780fbd5759b8f38b809e8cadf29cedee82a8

csharp/Facebook.CSSLayout/CSSNode.cs

@@ -62,19 +62,6 @@ namespace Facebook.CSSLayout
             Native.CSSNodeMarkDirty(_cssNode);
         }
 
-        public bool IsTextNode
-        {
-            get
-            {
-                return Native.CSSNodeGetIsTextnode(_cssNode);
-            }
-
-            set
-            {
-                Native.CSSNodeSetIsTextnode(_cssNode, value);
-            }
-        }
-
         public bool HasNewLayout
         {
             get

csharp/Facebook.CSSLayout/Native.cs

@@ -92,13 +92,6 @@ namespace Facebook.CSSLayout
         [return: MarshalAs(UnmanagedType.FunctionPtr)]
         public static extern CSSMeasureFunc CSSNodeGetMeasureFunc(IntPtr node);
 
-        [DllImport(DllName)]
-        public static extern void CSSNodeSetIsTextnode(IntPtr node, [MarshalAs(UnmanagedType.I1)] bool isTextNode);
-
-        [DllImport(DllName)]
-        [return: MarshalAs(UnmanagedType.I1)]
-        public static extern bool CSSNodeGetIsTextnode(IntPtr node);
-
         [DllImport(DllName)]
         public static extern void CSSNodeSetHasNewLayout(IntPtr node, [MarshalAs(UnmanagedType.I1)] bool hasNewLayout);