[Payments] Use C++ metric enums in Java.

chrome/android/javatests/src/org/chromium/chrome/browser/payments/PaymentRequestEmailTest.java

 // Copyright 2016 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.
 
 package org.chromium.chrome.browser.payments;
 
 import static org.chromium.chrome.browser.payments.PaymentRequestTestRule.HAVE_INSTRUMENTS;
 import static org.chromium.chrome.browser.payments.PaymentRequestTestRule.IMMEDIATE_RESPONSE;
 
 import android.support.test.filters.MediumTest;
@@ skipping 137 matching lines @@
      */
     @Test
     @MediumTest
     @Feature({"Payments"})
     public void testRequestedInformationMetric()
             throws InterruptedException, ExecutionException, TimeoutException {
         // Start the Payment Request.
         mPaymentRequestTestRule.triggerUIAndWait(mPaymentRequestTestRule.getReadyToPay());
 
         // Make sure that only the appropriate enum value was logged.
-        for (int i = 0; i < PaymentRequestMetrics.REQUESTED_INFORMATION_MAX; ++i) {
-            Assert.assertEquals((i == PaymentRequestMetrics.REQUESTED_INFORMATION_EMAIL ? 1 : 0),
+        for (int i = 0; i < RequestedInformation.MAX; ++i) {
+            Assert.assertEquals((i == RequestedInformation.EMAIL ? 1 : 0),
                     RecordHistogram.getHistogramValueCountForTesting(
                             "PaymentRequest.RequestedInformation", i));
         }
     }
 }