[Web Payments] Implement the credit card selection UI functionality.

chrome/browser/ui/views/payments/payment_request_credit_card_editor_interactive_uitest.cc

Index: chrome/browser/ui/views/payments/payment_request_credit_card_editor_interactive_uitest.cc
diff --git a/chrome/browser/ui/views/payments/payment_request_credit_card_editor_interactive_uitest.cc b/chrome/browser/ui/views/payments/payment_request_credit_card_editor_interactive_uitest.cc
index e408da89f596c9b99461eb5bee005ca61fc25579..0760385b53bb70cf9158337bb6336151806bd8c1 100644
--- a/chrome/browser/ui/views/payments/payment_request_credit_card_editor_interactive_uitest.cc
+++ b/chrome/browser/ui/views/payments/payment_request_credit_card_editor_interactive_uitest.cc
@@ -12,12 +12,10 @@
 #include "chrome/browser/ui/views/payments/validating_textfield.h"
 #include "components/autofill/core/browser/field_types.h"
 #include "components/autofill/core/browser/personal_data_manager.h"
-#include "components/autofill/core/browser/personal_data_manager_observer.h"
 #include "components/autofill/core/browser/test_autofill_clock.h"
 #include "components/payments/payment_request.h"
 #include "components/strings/grit/components_strings.h"
 #include "content/public/test/browser_test_utils.h"
-#include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/base/l10n/l10n_util.h"
 
@@ -27,19 +25,6 @@ namespace {
 
 const base::Time kJune2017 = base::Time::FromDoubleT(1497552271);
 
-ACTION_P(QuitMessageLoop, loop) {
-  loop->Quit();
-}
-
-class PersonalDataLoadedObserverMock
-    : public autofill::PersonalDataManagerObserver {
- public:
-  PersonalDataLoadedObserverMock() {}
-  virtual ~PersonalDataLoadedObserverMock() {}
-
-  MOCK_METHOD0(OnPersonalDataChanged, void());
-};
-
 }  // namespace
 
 class PaymentRequestCreditCardEditorTest