[Payments] Remove redundant string

chrome/android/java/src/org/chromium/chrome/browser/payments/PaymentPreferencesUtil.java

Index: chrome/android/java/src/org/chromium/chrome/browser/payments/PaymentPreferencesUtil.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/payments/PaymentPreferencesUtil.java b/chrome/android/java/src/org/chromium/chrome/browser/payments/PaymentPreferencesUtil.java
index 1e5f11b999e823d96e3e9d026885e3fe67bceb27..7c5227bae822be1c7d06c398b291678af1126e19 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/payments/PaymentPreferencesUtil.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/payments/PaymentPreferencesUtil.java
@@ -15,9 +15,6 @@ public class PaymentPreferencesUtil {
     /** Preference to indicate whether payment request has been completed successfully once.*/
     private static final String PAYMENT_COMPLETE_ONCE = "payment_complete_once";
 
-    /** Prefix of the preferences to persist Android payment apps' status. */
-    public static final String PAYMENT_ANDROID_APP_ENABLED_ = "payment_android_app_enabled_";
-
     /** Prefix of the preferences to persist use count of the payment instruments. */
     public static final String PAYMENT_INSTRUMENT_USE_COUNT_ = "payment_instrument_use_count_";