[Payments] Add integration test for canceling editor by clicking Android back button

chrome/android/java/src/org/chromium/chrome/browser/payments/ui/EditorView.java

Index: chrome/android/java/src/org/chromium/chrome/browser/payments/ui/EditorView.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/payments/ui/EditorView.java b/chrome/android/java/src/org/chromium/chrome/browser/payments/ui/EditorView.java
index 5bafea6b98122b9f14353a0e4cf6c5b4a6056c1e..75f294b70c1a0410b4206c77aee796eca252a7c9 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/payments/ui/EditorView.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/payments/ui/EditorView.java
@@ -372,6 +372,19 @@ public class EditorView extends AlwaysDismissedDialog implements OnClickListener
         mDataView.addView(mFooter);
     }
 
+    private void removeTextChangedListenersAndInputFilters() {
+        if (mCardInput != null) {
+            mCardInput.removeTextChangedListener(mCardNumberFormatter);
+            mCardInput.setFilters(new InputFilter[0]); // Null is not allowed.
+            mCardInput = null;
+        }
+
+        if (mPhoneInput != null) {
+            mPhoneInput.removeTextChangedListener(mPhoneFormatter);
+            mPhoneInput = null;
+        }
+    }
+
     private View addFieldViewToEditor(ViewGroup parent, final EditorFieldModel fieldModel) {
         View childView = null;
 
@@ -524,19 +537,6 @@ public class EditorView extends AlwaysDismissedDialog implements OnClickListener
         }
     }
 
-    private void removeTextChangedListenersAndInputFilters() {
-        if (mCardInput != null) {
-            mCardInput.removeTextChangedListener(mCardNumberFormatter);
-            mCardInput.setFilters(new InputFilter[0]); // Null is not allowed.
-            mCardInput = null;
-        }
-
-        if (mPhoneInput != null) {
-            mPhoneInput.removeTextChangedListener(mPhoneFormatter);
-            mPhoneInput = null;
-        }
-    }
-
     private List<EditorFieldView> getViewsWithInvalidInformation(boolean findAll) {
         List<EditorFieldView> invalidViews = new ArrayList<>();
         for (int i = 0; i < mFieldViews.size(); i++) {