Make ThreadTestHelper sequence-friendly.

base/test/thread_test_helper.h

Index: base/test/thread_test_helper.h
diff --git a/base/test/thread_test_helper.h b/base/test/thread_test_helper.h
index 829a6197eab88edce2bb53d9bf804481537ce1db..935e7efc6b95f4acfc077b6b470abba694e11348 100644
--- a/base/test/thread_test_helper.h
+++ b/base/test/thread_test_helper.h
@@ -8,21 +8,21 @@
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
-#include "base/single_thread_task_runner.h"
+#include "base/sequenced_task_runner.h"
 #include "base/synchronization/waitable_event.h"
 
 namespace base {
 
-// Helper class that executes code on a given thread while blocking on the
-// invoking thread. To use, derive from this class and overwrite RunTest. An
-// alternative use of this class is to use it directly.  It will then block
-// until all pending tasks on a given thread have been executed.
+// Helper class that executes code on a given target sequence/thread while
+// blocking on the invoking sequence/thread. To use, derive from this class and
+// overwrite RunTest. An alternative use of this class is to use it directly. It
+// will then block until all pending tasks on a given sequence/thread have been
+// executed.
 class ThreadTestHelper : public RefCountedThreadSafe<ThreadTestHelper> {
  public:
-  explicit ThreadTestHelper(
-      scoped_refptr<SingleThreadTaskRunner> target_thread);
+  explicit ThreadTestHelper(scoped_refptr<SequencedTaskRunner> target_sequence);
 
-  // True if RunTest() was successfully executed on the target thread.
+  // True if RunTest() was successfully executed on the target sequence.
   bool Run() WARN_UNUSED_RESULT;
 
   virtual void RunTest();
@@ -36,10 +36,10 @@ class ThreadTestHelper : public RefCountedThreadSafe<ThreadTestHelper> {
   void set_test_result(bool test_result) { test_result_ = test_result; }
 
  private:
-  void RunInThread();
+  void RunOnSequence();
 
   bool test_result_;
-  scoped_refptr<SingleThreadTaskRunner> target_thread_;
+  scoped_refptr<SequencedTaskRunner> target_sequence_;
   WaitableEvent done_event_;
 
   DISALLOW_COPY_AND_ASSIGN(ThreadTestHelper);