service worker: Enable ServiceWorkerBlackBoxBrowserTest.Registration on cros

content/browser/service_worker/service_worker_browsertest.cc

 // Copyright 2014 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 <stddef.h>
 #include <stdint.h>
 
 #include <map>
 #include <memory>
 #include <utility>
@@ skipping 1426 matching lines @@
 static int CountRenderProcessHosts() {
   int result = 0;
   for (RenderProcessHost::iterator iter(RenderProcessHost::AllHostsIterator());
        !iter.IsAtEnd();
        iter.Advance()) {
     result++;
   }
   return result;
 }
 
-// Flaky timeouts on CrOS: http://crbug.com/387045
-#if defined(OS_CHROMEOS)
-#define MAYBE_Registration DISABLED_Registration
-#else
-#define MAYBE_Registration Registration
-#endif
-IN_PROC_BROWSER_TEST_F(ServiceWorkerBlackBoxBrowserTest, MAYBE_Registration) {
+IN_PROC_BROWSER_TEST_F(ServiceWorkerBlackBoxBrowserTest, Registration) {
   // Close the only window to be sure we're not re-using its RenderProcessHost.
   shell()->Close();
   EXPECT_EQ(0, CountRenderProcessHosts());
 
   const char kWorkerUrl[] = "/service_worker/fetch_event.js";
   const char kScope[] = "/service_worker/";
 
   // Unregistering nothing should return false.
   {
     base::RunLoop run_loop;
@@ skipping 431 matching lines @@
  private:
   DISALLOW_COPY_AND_ASSIGN(ServiceWorkerV8CacheStrategiesAggressiveTest);
 };
 
 IN_PROC_BROWSER_TEST_F(ServiceWorkerV8CacheStrategiesAggressiveTest,
                        V8CacheOnCacheStorage) {
   CheckStrategyIsAggressive();
 }
 
 }  // namespace content