Fix flaky SW registration in PushMessaging/BudgetManager browser tests

chrome/browser/budget_service/budget_manager_browsertest.cc

 // Copyright 2016 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/bind_helpers.h"
 #include "base/command_line.h"
 #include "base/run_loop.h"
 #include "build/build_config.h"
 #include "chrome/browser/budget_service/budget_manager.h"
 #include "chrome/browser/budget_service/budget_manager_factory.h"
@@ skipping 100 matching lines @@
 
   // Consume should succeed because there is an existing reservation.
   ConsumeReservation();
   ASSERT_TRUE(success());
 
   // Second consume should fail because the reservation is consumed.
   ConsumeReservation();
   ASSERT_FALSE(success());
 }
 
-// Flaky on ChromeOS and Linux. See http://crbug.com/657202.
-#if defined(OS_CHROMEOS) || defined(OS_LINUX)
-#define MAYBE_BudgetInWorker DISABLED_BudgetInWorker
-#else
-#define MAYBE_BudgetInWorker BudgetInWorker
-#endif
-IN_PROC_BROWSER_TEST_F(BudgetManagerBrowserTest, MAYBE_BudgetInWorker) {
+IN_PROC_BROWSER_TEST_F(BudgetManagerBrowserTest, BudgetInWorker) {
   std::string script_result;
 
   ASSERT_TRUE(RunScript("registerServiceWorker()", &script_result));
   ASSERT_EQ("ok - service worker registered", script_result);
 
   LoadTestPage();  // Reload to become controlled.
 
   ASSERT_TRUE(RunScript("isControlled()", &script_result));
   ASSERT_EQ("true - is controlled", script_result);
 
@@ skipping 23 matching lines @@
 
   ConsumeReservation();
   ASSERT_TRUE(success());
 
   // One more consume should fail, because all reservations are consumed.
   ConsumeReservation();
   ASSERT_FALSE(success());
 }
 
 }  // namespace