NSData: Dont add deprecated methods

Foundation/NSData.swift

@@ -177,18 +177,6 @@ open class NSData : NSObject, NSCopying, NSMutableCopying, NSSecureCoding {
         }
     }
 
-    @available(*, deprecated)
-    /// Initializes a data object with the contents of the mapped file specified by a given path.
-    public init?(contentsOfMappedFile path: String) {
-        NSUnimplemented()
-    }
-
-    @available(*, deprecated)
-    /// Creates and returns a data object from the mapped file at a given path.
-    class func dataWithContentsOfMappedFile(_ path: String) -> Any? {
-        NSUnimplemented()
-    }
-
     /// Initializes a data object with the contents of another data object.
     public init(data: Data) {
         super.init()
@@ -245,12 +233,6 @@ open class NSData : NSObject, NSCopying, NSMutableCopying, NSSecureCoding {
         _init(bytes: UnsafeMutableRawPointer(mutating: decodedBytes), length: decodedBytes.count, copy: true)
     }
 
-    @available(*, deprecated)
-    /// Initializes a data object initialized with the given Base64 encoded string.
-    public init?(base64Encoding base64String: String) {
-        NSUnimplemented()
-    }
-
     /// Initializes a data object with the given Base64 encoded data.
     public init?(base64Encoded base64Data: Data, options: Base64DecodingOptions = []) {
         var encodedBytes = [UInt8](repeating: 0, count: base64Data.count)
@@ -743,13 +725,6 @@ open class NSData : NSObject, NSCopying, NSMutableCopying, NSSecureCoding {
         return Data(bytes: encodedBytes, count: encodedBytes.count)
     }
 
-    @available(*, deprecated)
-    /// Initializes a Base64 encoded String from the data object.
-    /// Deprecated: You should transition to either base64EncodedString(options:) or base64EncodedData(options:)
-    func base64Encoding() -> String {
-        return base64EncodedString()
-    }
-
     /// The ranges of ASCII characters that are used to encode data in Base64.
     private static let base64ByteMappings: [Range<UInt8>] = [
         65 ..< 91,      // A-Z