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

cc/output/begin_frame_args.cc

Index: cc/output/begin_frame_args.cc
diff --git a/cc/output/begin_frame_args.cc b/cc/output/begin_frame_args.cc
index 98f0a3e446f616744735c27b7fa4ce65adec4513..e25d2f55c271123f8ee799a5c1d62aadf534bc2c 100644
--- a/cc/output/begin_frame_args.cc
+++ b/cc/output/begin_frame_args.cc
@@ -98,9 +98,9 @@ BeginFrameArgs BeginFrameArgs::Create(BeginFrameArgs::CreationLocation location,
 #endif
 }
 
-scoped_ptr<base::trace_event::ConvertableToTraceFormat>
+std::unique_ptr<base::trace_event::ConvertableToTraceFormat>
 BeginFrameArgs::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);