Convert //components/[o-t]* from scoped_ptr to std::unique_ptr

components/tracing/child_trace_message_filter.cc

Index: components/tracing/child_trace_message_filter.cc
diff --git a/components/tracing/child_trace_message_filter.cc b/components/tracing/child_trace_message_filter.cc
index b0b790a772247285bd5b7deb3882d507b958613e..ac05a180b5b60f92d0c69a6ea4ca615b3b546e6e 100644
--- a/components/tracing/child_trace_message_filter.cc
+++ b/components/tracing/child_trace_message_filter.cc
@@ -4,6 +4,8 @@
 
 #include "components/tracing/child_trace_message_filter.h"
 
+#include <memory>
+
 #include "base/memory/ref_counted_memory.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/metrics/statistics_recorder.h"
@@ -255,12 +257,13 @@ void ChildTraceMessageFilter::OnSetUMACallback(
   if (!existing_histogram)
     return;
 
-  scoped_ptr<base::HistogramSamples> samples =
+  std::unique_ptr<base::HistogramSamples> samples =
       existing_histogram->SnapshotSamples();
   if (!samples)
     return;
 
-  scoped_ptr<base::SampleCountIterator> sample_iterator = samples->Iterator();
+  std::unique_ptr<base::SampleCountIterator> sample_iterator =
+      samples->Iterator();
   if (!sample_iterator)
     return;