Revert "Constrain type annotations with deferred types."

sdk/lib/_internal/compiler/implementation/js/builder.dart

Index: sdk/lib/_internal/compiler/implementation/js/builder.dart
diff --git a/sdk/lib/_internal/compiler/implementation/js/builder.dart b/sdk/lib/_internal/compiler/implementation/js/builder.dart
index f7c74e493ea826e60ce068a531cd9dbe68e1e673..ab05952753b919add5299320118378f664d213a3 100644
--- a/sdk/lib/_internal/compiler/implementation/js/builder.dart
+++ b/sdk/lib/_internal/compiler/implementation/js/builder.dart
@@ -45,36 +45,6 @@ class JsBuilder {
     return call(source, expression);
   }
 
-  /// Creates a litteral js string from [value].
-  LiteralString escapedString(String value) {
-    // Do not escape unicode characters and ' because they are allowed in the
-    // string literal anyway.
-    String escaped =
-        value.replaceAllMapped(new RegExp('\n|"|\\|\0|\b|\t|\v'), (match) {
-      switch (match.group(0)) {
-        case "\n" : return r"\n";
-        case "\\" : return r"\\";
-        case "\"" : return r'\"';
-        case "\0" : return r"\0";
-        case "\b" : return r"\b";
-        case "\t" : return r"\t";
-        case "\f" : return r"\f";
-        case "\v" : return r"\v";
-      }
-    });
-    LiteralString result = string(escaped);
-    // We don't escape ' under the assumption that the string is wrapped
-    // into ". Verify that assumption.
-    assert(result.value.codeUnitAt(0) == '"');
-    return result;
-  }
-
-  /// Creates a litteral js string from [value].
-  ///
-  /// Note that this function only puts quotes around [value]. It does not do
-  /// any escaping, so use only when you can guarantee that [value] does not
-  /// contain newlines or backslashes. For escaping the string use
-  /// [escapedString].
   LiteralString string(String value) => new LiteralString('"$value"');
 
   LiteralNumber number(num value) => new LiteralNumber('$value');