Remove "using System.Xml"

Author: veblush

src/Newtonsoft.Json/JsonConvert.cs

@@ -34,7 +34,9 @@
 #endif
 using Newtonsoft.Json.Linq;
 using Newtonsoft.Json.Utilities;
+#if !(UNITY3D)
 using System.Xml;
+#endif
 using Newtonsoft.Json.Converters;
 using Newtonsoft.Json.Serialization;
 using System.Text;
@@ -504,7 +506,7 @@ public static string ToString(object value)
             throw new ArgumentException("Unsupported type: {0}. Use the JsonSerializer class to get the object's JSON representation.".FormatWith(CultureInfo.InvariantCulture, value.GetType()));
         }
 
-        #region Serialize
+#region Serialize
         /// <summary>
         /// Serializes the specified object to a JSON string.
         /// </summary>
@@ -693,9 +695,9 @@ public static Task<string> SerializeObjectAsync(object value, Formatting formatt
             return Task.Factory.StartNew(() => SerializeObject(value, formatting, settings));
         }
 #endif
-        #endregion
+#endregion
 
-        #region Deserialize
+#region Deserialize
         /// <summary>
         /// Deserializes the JSON to a .NET object.
         /// </summary>
@@ -915,7 +917,7 @@ public static Task<object> DeserializeObjectAsync(string value, Type type, JsonS
             return Task.Factory.StartNew(() => DeserializeObject(value, type, settings));
         }
 #endif
-        #endregion
+#endregion
 
         /// <summary>
         /// Populates the object with values from the JSON string.

src/Newtonsoft.Json/JsonTextWriter.cs

@@ -31,7 +31,9 @@
 #endif
 using System.Text;
 using System.IO;
+#if !(UNITY3D)
 using System.Xml;
+#endif
 using Newtonsoft.Json.Utilities;
 
 namespace Newtonsoft.Json
@@ -333,7 +335,7 @@ private void WriteValueInternal(string value, JsonToken token)
             _writer.Write(value);
         }
 
-        #region WriteValue methods
+#region WriteValue methods
         /// <summary>
         /// Writes a <see cref="Object"/> value.
         /// An error will raised if the value cannot be written as a single JSON token.
@@ -705,7 +707,7 @@ public override void WriteValue(Uri value)
                 WriteEscapedString(value.OriginalString, true);
             }
         }
-        #endregion
+#endregion
 
         /// <summary>
         /// Writes out a comment <code>/*...*/</code> containing the specified text. 

src/Newtonsoft.Json/Utilities/DateTimeUtils.cs

@@ -25,7 +25,9 @@
 
 using System;
 using System.IO;
+#if !UNITY3D
 using System.Xml;
+#endif
 using System.Globalization;
 
 namespace Newtonsoft.Json.Utilities
@@ -195,7 +197,7 @@ internal static DateTime ConvertJavaScriptTicksToDateTime(long javaScriptTicks)
             return dateTime;
         }
 
-        #region Parse
+#region Parse
 
         internal static bool TryParseDateTimeIso(StringReference text, DateTimeZoneHandling dateTimeZoneHandling, out DateTime dt)
         {
@@ -583,9 +585,9 @@ private static bool TryReadOffset(StringReference offsetText, int startIndex, ou
 
             return true;
         }
-        #endregion
+#endregion
 
-        #region Write
+#region Write
         internal static void WriteDateTimeString(TextWriter writer, DateTime value, DateFormatHandling format, string formatString, CultureInfo culture)
         {
             if (string.IsNullOrEmpty(formatString))
@@ -733,7 +735,7 @@ internal static void WriteDateTimeOffsetString(TextWriter writer, DateTimeOffset
             }
         }
 #endif
-        #endregion
+#endregion
 
         private static void GetDateValues(DateTime td, out int year, out int month, out int day)
         {