PaymentHandler: Fix a typo (camelCase to hacker_case).

content/browser/payments/payment_app_browsertest.cc

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/command_line.h"
 #include "base/macros.h"
 #include "base/run_loop.h"
 #include "components/payments/mojom/payment_app.mojom.h"
 #include "content/public/browser/payment_app_provider.h"
 #include "content/public/browser/web_contents.h"
@@ skipping 77 matching lines @@
       ids.push_back(manifest.first);
     }
 
     return ids;
   }
 
   payments::mojom::PaymentAppResponsePtr InvokePaymentApp(
       int64_t registration_id) {
     payments::mojom::PaymentAppRequestPtr app_request =
         payments::mojom::PaymentAppRequest::New();
-    app_request->methodData.push_back(
+    app_request->method_data.push_back(
         payments::mojom::PaymentMethodData::New());
     app_request->total = payments::mojom::PaymentItem::New();
     app_request->total->amount = payments::mojom::PaymentCurrencyAmount::New();
 
     base::RunLoop run_loop;
     payments::mojom::PaymentAppResponsePtr response;
     PaymentAppProvider::GetInstance()->InvokePaymentApp(
         shell()->web_contents()->GetBrowserContext(), registration_id,
         std::move(app_request),
         base::Bind(&InvokePaymentAppCallback, run_loop.QuitClosure(),
@@ skipping 13 matching lines @@
   RegisterPaymentApp();
 
   std::vector<int64_t> ids = GetAllPaymentAppIDs();
   ASSERT_EQ(1U, ids.size());
 
   payments::mojom::PaymentAppResponsePtr response(InvokePaymentApp(ids[0]));
   ASSERT_EQ("test", response->method_name);
 }
 
 }  // namespace content