Rework UMAHistogramHelper and StatisticsDeltaReader into [Chrome]HistogramTester.

chrome/browser/ui/views/passwords/manage_passwords_view_test.h

 // Copyright 2014 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.
 
 #ifndef CHROME_BROWSER_UI_VIEWS_PASSWORDS_MANAGE_PASSWORDS_VIEW_TEST_H_
 #define CHROME_BROWSER_UI_VIEWS_PASSWORDS_MANAGE_PASSWORDS_VIEW_TEST_H_
 
 #include "base/metrics/histogram_samples.h"
-#include "base/test/statistics_delta_reader.h"
+#include "base/test/histogram_tester.h"
 #include "chrome/test/base/in_process_browser_test.h"
 #include "components/autofill/core/common/password_form.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 class ManagePasswordsUIControllerMock;
 class ManagePasswordsIconView;
 
 // Test class for the various password management view bits and pieces. Sets
 // up a ManagePasswordsUIControllerMock, and provides some helper methods
 // to poke at the bubble, icon, and controller's state.
@@ skipping 22 matching lines @@
   // Put the controller, icon, and bubble into a blacklisted state.
   void SetupBlackistedPassword();
 
   // Get samples for |histogram|.
   base::HistogramSamples* GetSamples(const char* histogram);
 
   autofill::PasswordForm* test_form() { return &test_form_; }
 
  private:
   autofill::PasswordForm test_form_;
-  base::StatisticsDeltaReader statistics_reader_;
+  base::HistogramTester histogram_tester_;
 
   DISALLOW_COPY_AND_ASSIGN(ManagePasswordsViewTest);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_PASSWORDS_MANAGE_PASSWORDS_VIEW_TEST_H_