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

cc/test/ordered_simple_task_runner.cc

Index: cc/test/ordered_simple_task_runner.cc
diff --git a/cc/test/ordered_simple_task_runner.cc b/cc/test/ordered_simple_task_runner.cc
index cc211cab62a0981b3c84425917a38f9daed97f7f..a3d66ee6d3a58510e49557842b0498955f17fc83 100644
--- a/cc/test/ordered_simple_task_runner.cc
+++ b/cc/test/ordered_simple_task_runner.cc
@@ -64,9 +64,9 @@ bool TestOrderablePendingTask::operator<(
   return ShouldRunBefore(other);
 }
 
-scoped_ptr<base::trace_event::ConvertableToTraceFormat>
+std::unique_ptr<base::trace_event::ConvertableToTraceFormat>
 TestOrderablePendingTask::AsValue() const {
-  scoped_ptr<base::trace_event::TracedValue> state(
+  std::unique_ptr<base::trace_event::TracedValue> state(
       new base::trace_event::TracedValue());
   AsValueInto(state.get());
   return std::move(state);
@@ -261,9 +261,9 @@ bool OrderedSimpleTaskRunner::RunForPeriod(base::TimeDelta period) {
 }
 
 // base::trace_event tracing functionality
-scoped_ptr<base::trace_event::ConvertableToTraceFormat>
+std::unique_ptr<base::trace_event::ConvertableToTraceFormat>
 OrderedSimpleTaskRunner::AsValue() const {
-  scoped_ptr<base::trace_event::TracedValue> state(
+  std::unique_ptr<base::trace_event::TracedValue> state(
       new base::trace_event::TracedValue());
   AsValueInto(state.get());
   return std::move(state);