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

chrome/browser/password_manager/password_store_mac_unittest.cc

 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 #include "base/basictypes.h"
 #include "base/file_util.h"
 #include "base/path_service.h"
@@ skipping 10 matching lines @@
 using webkit_glue::PasswordForm;
 using testing::_;
 using testing::DoAll;
 using testing::WithArg;
 
 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) {
   STLDeleteContainerPointers(arg0.begin(), arg0.end());
 }
 
 ACTION(QuitUIMessageLoop) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   MessageLoop::current()->Quit();
 }
@@ skipping 973 matching lines @@
       EXPECT_EQ(0U, matching_items.size()) << "iteration " << i;
     }
     STLDeleteElements(&matching_items);
 
     login_db_->GetLogins(*query_form, &matching_items);
     EXPECT_EQ(updates[i].password ? 1U : 0U, matching_items.size())
         << "iteration " << i;
     STLDeleteElements(&matching_items);
   }
 }