Don't parse factory keyword as a type.

dart/lib/compiler/implementation/scanner/listener.dart

Index: dart/lib/compiler/implementation/scanner/listener.dart
diff --git a/dart/lib/compiler/implementation/scanner/listener.dart b/dart/lib/compiler/implementation/scanner/listener.dart
index cb986b4c08dd3bb63de7d14563f296751fc893ac..72a03b3d7f7f4cbdb3dcdf6d6c2fca3c83e4f91f 100644
--- a/dart/lib/compiler/implementation/scanner/listener.dart
+++ b/dart/lib/compiler/implementation/scanner/listener.dart
@@ -1459,9 +1459,14 @@ class PartialFunctionElement extends FunctionElement {
 
   FunctionExpression parseNode(DiagnosticListener listener) {
     if (cachedNode != null) return cachedNode;
-    cachedNode = parse(listener,
-                       getCompilationUnit(),
-                       (p) => p.parseFunction(beginToken, getOrSet));
+    Node parseFunction(Parser p) {
+      if (isMember() && p.optional('factory', beginToken)) {
+        return p.parseFactoryMethod(beginToken);
+      } else {
+        return p.parseFunction(beginToken, getOrSet);
+      }
+    }
+    cachedNode = parse(listener, getCompilationUnit(), parseFunction);
     return cachedNode;
   }