Fix parsing of max-age in SdchManager.

net/base/sdch_manager_unittest.cc

Index: net/base/sdch_manager_unittest.cc
diff --git a/net/base/sdch_manager_unittest.cc b/net/base/sdch_manager_unittest.cc
index 6ae186f090fd96612aef090a9f55b7c120af5e80..0fd47f2f921f7db503618df83b206bcc549dd5c4 100644
--- a/net/base/sdch_manager_unittest.cc
+++ b/net/base/sdch_manager_unittest.cc
@@ -556,6 +556,8 @@ TEST_F(SdchManagerTest, GetDictionaryNotification) {
 TEST_F(SdchManagerTest, ExpirationCheckedProperly) {
   // Create an SDCH dictionary with an expiration time in the past.
   std::string dictionary_domain("x.y.z.google.com");
+  // TODO(eroman): "max-age: -1" is invalid. -1 is not a valid production of
+  // delta-seconds (must be non-negative).
   std::string dictionary_text(base::StringPrintf("Domain: %s\nMax-age: -1\n\n",
                                                  dictionary_domain.c_str()));
   dictionary_text.append(