Instantiate ScopedTaskEnvironment in net unittests.

net/url_request/url_request_file_dir_job_unittest.cc

Index: net/url_request/url_request_file_dir_job_unittest.cc
diff --git a/net/url_request/url_request_file_dir_job_unittest.cc b/net/url_request/url_request_file_dir_job_unittest.cc
index 0f29d9097ba65a69206a2c51cf5ce881ba7be532..9355af12588bc1ca46e53568611ca74eaad8b783 100644
--- a/net/url_request/url_request_file_dir_job_unittest.cc
+++ b/net/url_request/url_request_file_dir_job_unittest.cc
@@ -12,9 +12,8 @@
 #include "base/files/scoped_temp_dir.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
-#include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
-#include "base/test/scoped_task_scheduler.h"
+#include "base/task_scheduler/task_scheduler.h"
 #include "net/base/filename_util.h"
 #include "net/base/io_buffer.h"
 #include "net/base/net_errors.h"
@@ -95,12 +94,9 @@ class TestDirectoryURLRequestDelegate : public TestDelegate {
 
 class URLRequestFileDirTest : public testing::Test {
  public:
-  URLRequestFileDirTest()
-      : scoped_task_scheduler_(base::MessageLoop::current()),
-        buffer_(new IOBuffer(kBufferSize)) {}
+  URLRequestFileDirTest() : buffer_(new IOBuffer(kBufferSize)) {}
 
  protected:
-  base::test::ScopedTaskScheduler scoped_task_scheduler_;
   TestURLRequestContext context_;
   TestDirectoryURLRequestDelegate delegate_;
   scoped_refptr<IOBuffer> buffer_;
@@ -125,6 +121,8 @@ TEST_F(URLRequestFileDirTest, ListCompletionOnNoPending) {
   // will spin the message loop until the read error is returned to the
   // URLRequestFileDirJob.
   base::RunLoop().RunUntilIdle();
+  base::TaskScheduler::GetInstance()->FlushForTesting();
+  base::RunLoop().RunUntilIdle();
   ASSERT_TRUE(delegate_.got_response_started());
 
   int bytes_read = request->Read(buffer_.get(), kBufferSize);
@@ -155,6 +153,8 @@ TEST_F(URLRequestFileDirTest, DirectoryWithASingleFileSync) {
   // the message loop until the URLRequetsFileDirJob has received the
   // entire directory listing and cached it.
   base::RunLoop().RunUntilIdle();
+  base::TaskScheduler::GetInstance()->FlushForTesting();
+  base::RunLoop().RunUntilIdle();
 
   // This will complete synchronously, since the URLRequetsFileDirJob had
   // directory listing cached in memory.