Revert "Added as type for backward compatibility"

This reverts commit 296f9c5091.

spring-cloud-contract-spec/src/main/groovy/org/springframework/cloud/contract/spec/internal/FromFileProperty.groovy

@@ -66,14 +66,4 @@ class FromFileProperty implements Serializable {
 		return this.file.bytes
 	}
 
-	public <T> T asType(T type) {
-		switch (type) {
-			case String:
-				return (T) asString()
-			case byte[]:
-				return (T) asBytes()
-		}
-		throw new UnsupportedOperationException("Can't cast to type [${type}]")
-	}
-
 }