Turn on braintree in sandbox.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=119890386

java/com/google/domain/registry/ui/js/registrar/payment.js

@@ -189,11 +189,7 @@ registry.registrar.Payment.prototype.bindToDom = function(id) {
  */
 registry.registrar.Payment.prototype.onSetup_ = function(response) {
   if (response.status != 'SUCCESS') {
-    // Check for hard-coded error message codes from backend.
+    if (response.message == 'not-using-cc-billing') {
-    if (response.message == 'sandbox') {
-      goog.soy.renderElement(this.content_,
-                             registry.soy.registrar.payment.sandbox);
-    } else if (response.message == 'not-using-cc-billing') {
       goog.soy.renderElement(this.content_,
                              registry.soy.registrar.payment.notUsingCcBilling);
     } else {

java/com/google/domain/registry/ui/soy/registrar/Payment.soy

@@ -115,17 +115,6 @@
 {/template}
 
 
-/** Page used to disable page in sandbox environment. */
-{template .sandbox}
-  <div class="{css reg-payment}">
-    <h1>Payment Page Disabled</h1>
-    <p>
-      The payment page is not available in the OT&amp;E environment. Please
-      login to the production Registrar Console.
-  </div>
-{/template}
-
-
 /** Page indicating customer is not on credit card billing terms. */
 {template .notUsingCcBilling}
   <div class="{css reg-payment}">

javatests/com/google/domain/registry/ui/js/registrar/payment_test.js

@@ -53,20 +53,6 @@ function tearDown() {
 }
 
 
-function testSandbox_showsDisabled() {
-  registry.testing.assertReqMockRsp(
-      '?',
-      '/registrar-payment-setup',
-      {},
-      {
-        status: 'ERROR',
-        message: 'sandbox'
-      });
-  assertContains('Payment Page Disabled',
-                 goog.dom.getTextContent($$('reg-payment')));
-}
-
-
 function testRenderForm() {
   registry.testing.assertReqMockRsp(
       '?',