Fix DCHECK, memory leak, and refactor PasswordStore to use CancelableRequest

chrome/browser/password_manager/password_store_mac_unittest.cc

Index: chrome/browser/password_manager/password_store_mac_unittest.cc
diff --git a/chrome/browser/password_manager/password_store_mac_unittest.cc b/chrome/browser/password_manager/password_store_mac_unittest.cc
index d8e3a07d72a7ea0d14d467285b10ba252a294740..9cc3f60b38579ea44add66f8f441e738d0b018bb 100644
--- a/chrome/browser/password_manager/password_store_mac_unittest.cc
+++ b/chrome/browser/password_manager/password_store_mac_unittest.cc
@@ -28,7 +28,8 @@ namespace {
 class MockPasswordStoreConsumer : public PasswordStoreConsumer {
 public:
   MOCK_METHOD2(OnPasswordStoreRequestDone,
-               void(int, const std::vector<webkit_glue::PasswordForm*>&));
+               void(PasswordStore::Handle,
+                    const std::vector<webkit_glue::PasswordForm*>&));
 };
 
 ACTION(STLDeleteElements0) {