base::RefCounted now DCHECKs when referenced from multiple threads.

base/deferred_sequenced_task_runner_unittest.cc

Index: base/deferred_sequenced_task_runner_unittest.cc
diff --git a/base/deferred_sequenced_task_runner_unittest.cc b/base/deferred_sequenced_task_runner_unittest.cc
index 81f2a0a00c9beb39b0934ce4e942d6bfd9671837..cc07326e2a0b5cc92cfb73900e4ba27e31e7efe3 100644
--- a/base/deferred_sequenced_task_runner_unittest.cc
+++ b/base/deferred_sequenced_task_runner_unittest.cc
@@ -20,8 +20,9 @@ namespace {
 class DeferredSequencedTaskRunnerTest : public testing::Test,
                                         public base::NonThreadSafe {
  public:
+  // TODO(mgiuca): Avoid using UnsafeRefCounted. http://crbug.com/469952.
   class ExecuteTaskOnDestructor :
-      public base::RefCounted<ExecuteTaskOnDestructor> {
+      public base::UnsafeRefCounted<ExecuteTaskOnDestructor> {
    public:
     ExecuteTaskOnDestructor(
         DeferredSequencedTaskRunnerTest* executor,
@@ -30,7 +31,7 @@ class DeferredSequencedTaskRunnerTest : public testing::Test,
           task_id_(task_id) {
     }
   private:
-    friend class base::RefCounted<ExecuteTaskOnDestructor>;
+    friend class base::UnsafeRefCounted<ExecuteTaskOnDestructor>;
     virtual ~ExecuteTaskOnDestructor() {
       executor_->ExecuteTask(task_id_);
     }