Convert //cc from scoped_ptr to std::unique_ptr.

cc/trees/blocking_task_runner_unittest.cc

Index: cc/trees/blocking_task_runner_unittest.cc
diff --git a/cc/trees/blocking_task_runner_unittest.cc b/cc/trees/blocking_task_runner_unittest.cc
index f837a7ccd4808192fca15c6547cd74e258cf28f9..86bde3dc23512c3943386d41d958959ed7ee8baf 100644
--- a/cc/trees/blocking_task_runner_unittest.cc
+++ b/cc/trees/blocking_task_runner_unittest.cc
@@ -21,7 +21,7 @@ void TestTask(bool* result) {
 
 TEST(BlockingTaskRunnerTest, NoCapture) {
   bool did_run = false;
-  scoped_ptr<BlockingTaskRunner> runner(
+  std::unique_ptr<BlockingTaskRunner> runner(
       BlockingTaskRunner::Create(base::ThreadTaskRunnerHandle::Get()));
   runner->PostTask(FROM_HERE, base::Bind(&TestTask, &did_run));
   EXPECT_FALSE(did_run);
@@ -31,7 +31,7 @@ TEST(BlockingTaskRunnerTest, NoCapture) {
 
 TEST(BlockingTaskRunnerTest, Capture) {
   bool did_run = false;
-  scoped_ptr<BlockingTaskRunner> runner(
+  std::unique_ptr<BlockingTaskRunner> runner(
       BlockingTaskRunner::Create(base::ThreadTaskRunnerHandle::Get()));
   {
     BlockingTaskRunner::CapturePostTasks capture(runner.get());