Reverting 9527

utils/pub/utils.dart

Index: utils/pub/utils.dart
diff --git a/utils/pub/utils.dart b/utils/pub/utils.dart
index 6aef021573c852584606209f93fd363105431079..60f8ab09749a5303189b2d875dacc48554ed7633 100644
--- a/utils/pub/utils.dart
+++ b/utils/pub/utils.dart
@@ -7,8 +7,6 @@
  */
 #library('utils');
 
-#import('dart:crypto');
-
 /** Thrown by methods that parse text when the text isn't a valid. */
 class FormatException implements Exception {
   final String message;
@@ -112,9 +110,3 @@ bool endsWithPattern(String str, Pattern matcher) {
   }
   return false;
 }
-
-/**
- * Returns the hex-encoded sha1 hash of [source].
- */
-String sha1(String source) =>
-  CryptoUtils.bytesToHex(new SHA1().update(source.charCodes()).digest());