Land Alexander's change that turns assert into a keyword.

lib/compiler/implementation/universe/universe.dart

Index: lib/compiler/implementation/universe/universe.dart
diff --git a/lib/compiler/implementation/universe/universe.dart b/lib/compiler/implementation/universe/universe.dart
index 3baa353b64a6cb4590542ab0b1d7df70428119af..ff7f052bdc20366480b5da1ecee59989c66cca94 100644
--- a/lib/compiler/implementation/universe/universe.dart
+++ b/lib/compiler/implementation/universe/universe.dart
@@ -201,13 +201,8 @@ class Selector {
   bool isUnaryOperator() => isOperator() && argumentCount == 0;
   bool isBinaryOperator() => isOperator() && argumentCount == 1;
 
-  /** Check whether this is a call to 'assert' with one positional parameter. */
-  bool isAssertSyntax() {
-    return (isCall() &&
-            name.stringValue === "assert" &&
-            argumentCount == 1 &&
-            namedArgumentCount == 0);
-  }
+  /** Check whether this is a call to 'assert'. */
+  bool isAssert() => isCall() && name.stringValue === "assert";
 
   int hashCode() => argumentCount + 1000 * namedArguments.length;
   int get namedArgumentCount => namedArguments.length;