Rename File.readAsText to File.readAsString. There is no Text type in Dart

sdk/lib/io/file.dart

Index: sdk/lib/io/file.dart
diff --git a/sdk/lib/io/file.dart b/sdk/lib/io/file.dart
index 43ff45b9ce6612c9feaedeb732fa6094cced4d80..97fc18c9bcc106bb891365d5c056ec9f7c8d6fd1 100644
--- a/sdk/lib/io/file.dart
+++ b/sdk/lib/io/file.dart
@@ -184,19 +184,19 @@ abstract class File {
   List<int> readAsBytesSync();
 
   /**
-   * Read the entire file contents as text using the given
+   * Read the entire file contents as a string using the given
    * [encoding].
    *
    * Returns a [:Future<String>:] that completes with the string once
    * the file contents has been read.
    */
-  Future<String> readAsText([Encoding encoding = Encoding.UTF_8]);
+  Future<String> readAsString([Encoding encoding = Encoding.UTF_8]);
 
   /**
-   * Synchronously read the entire file contents as text using the
+   * Synchronously read the entire file contents as a string using the
    * given [encoding].
    */
-  String readAsTextSync([Encoding encoding = Encoding.UTF_8]);
+  String readAsStringSync([Encoding encoding = Encoding.UTF_8]);
 
   /**
    * Read the entire file contents as lines of text using the give