Make base::Timer sequence-friendly.

content/browser/service_worker/service_worker_browsertest.cc

Index: content/browser/service_worker/service_worker_browsertest.cc
diff --git a/content/browser/service_worker/service_worker_browsertest.cc b/content/browser/service_worker/service_worker_browsertest.cc
index 3f96ad842386c5c7acf27cc5b5d3c694de31f0aa..80c02c855744a6ba5af99fcd338a3bc166b31292 100644
--- a/content/browser/service_worker/service_worker_browsertest.cc
+++ b/content/browser/service_worker/service_worker_browsertest.cc
@@ -663,6 +663,7 @@ class ServiceWorkerVersionBrowserTest : public ServiceWorkerBrowserTest {
 
   void TimeoutWorkerOnIOThread() {
     ASSERT_TRUE(BrowserThread::CurrentlyOn(BrowserThread::IO));
+    EXPECT_TRUE(version_->timeout_timer_.IsRunning());
     version_->SimulatePingTimeoutForTesting();
   }
 
@@ -1174,7 +1175,6 @@ IN_PROC_BROWSER_TEST_F(ServiceWorkerVersionBrowserTest, TimeoutStartingWorker) {
 
   // Simulate execution timeout. Use a delay to prevent killing the worker
   // before it's started execution.
-  EXPECT_TRUE(version_->timeout_timer_.IsRunning());
   RunOnIOThreadWithDelay(
       base::Bind(&self::TimeoutWorkerOnIOThread, base::Unretained(this)),
       base::TimeDelta::FromMilliseconds(100));
@@ -1208,7 +1208,6 @@ IN_PROC_BROWSER_TEST_F(ServiceWorkerVersionBrowserTest, TimeoutWorkerInEvent) {
 
   // Simulate execution timeout. Use a delay to prevent killing the worker
   // before it's started execution.
-  EXPECT_TRUE(version_->timeout_timer_.IsRunning());
   RunOnIOThreadWithDelay(
       base::Bind(&self::TimeoutWorkerOnIOThread, base::Unretained(this)),
       base::TimeDelta::FromMilliseconds(100));