Revert "Add GPayAppDynamicUpdate feature flag."

This reverts commit 02d1e955.

Reason for revert:

Findit (https://goo.gl/kROfz5) identified CL at revision 844274 as the
culprit for failures in the build cycles as shown on:
https://analysis.chromium.org/waterfall/culprit?key=ag9zfmZpbmRpdC1mb3ItbWVyRAsSDVdmU3VzcGVjdGVkQ0wiMWNocm9taXVtLzAyZDFlOTU1YTczNjg0ZGI5ODU2Y2Q4MjAzYThjNGUzODRjOTIwZGMM

Sample Failed Build: https://ci.chromium.org/b/8857990510232294496

Sample Failed Step: compile

Original change's description:
> Add GPayAppDynamicUpdate feature flag.
> 
> The feature flag controls the GPay native app integration for dynamic update on Android.
> If this feature flag is enabled, the GooglePayPaymentApp would enable a callback service and handle communications between the native GPay app and the browser for dynamic updates on shipping and payment data.
> Design doc is go/dynamic-update-mweb.
> 
> Bug: 1074423
> Change-Id: I898199446179d6c314b833c3ecb8f017481fc596
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2628745
> Commit-Queue: Kaiyu Chen <kylechenkyc@google.com>
> Reviewed-by: Sahel Sharify <sahel@chromium.org>
> Reviewed-by: Rouslan Solomakhin <rouslan@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#844274}


Change-Id: I72abe5615c0ee585679600e2b757c0d10ea60ca9
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1074423
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2632842
Cr-Commit-Position: refs/heads/master@{#844357}

components/payments/content/android/java/src/org/chromium/components/payments/PaymentFeatureList.java

@@ -18,7 +18,6 @@ public class PaymentFeatureList {
     /** Alphabetical: */
     public static final String ANDROID_APP_PAYMENT_UPDATE_EVENTS = "AndroidAppPaymentUpdateEvents";
     public static final String ENFORCE_FULL_DELEGATION = "EnforceFullDelegation";
-    public static final String GPAY_APP_DYNAMIC_UPDATE = "GPayAppDynamicUpdate";
     public static final String PAYMENT_REQUEST_SKIP_TO_GPAY = "PaymentRequestSkipToGPay";
     public static final String PAYMENT_REQUEST_SKIP_TO_GPAY_IF_NO_CARD =
             "PaymentRequestSkipToGPayIfNoCard";

components/payments/content/android/payment_feature_list.cc

@@ -27,7 +27,6 @@ const base::Feature* kFeaturesExposedToJava[] = {
     &features::kAppStoreBilling,
     &features::kAppStoreBillingDebug,
     &features::kEnforceFullDelegation,
-    &features::kGPayAppDynamicUpdate,
     &features::kPaymentRequestSkipToGPay,
     &features::kPaymentRequestSkipToGPayIfNoCard,
     &features::kReturnGooglePayInBasicCard,

components/payments/core/features.cc

@@ -89,8 +89,5 @@ const base::Feature kSecurePaymentConfirmation {
 #endif  // OS_MAC
 };
 
-const base::Feature kGPayAppDynamicUpdate{"GPayAppDynamicUpdate",
-                                          base::FEATURE_DISABLED_BY_DEFAULT};
-
 }  // namespace features
 }  // namespace payments

components/payments/core/features.h

@@ -90,10 +90,6 @@ extern const base::Feature kEnforceFullDelegation;
 // SecurePaymentConfirmation to be available.
 extern const base::Feature kSecurePaymentConfirmation;
 
-// If enabled, the GooglePayPaymentApp handles communications between the native
-// GPay app and the browser for dynamic updates on shipping and payment data.
-extern const base::Feature kGPayAppDynamicUpdate;
-
 }  // namespace features
 }  // namespace payments