Convert //components/metrics from scoped_ptr to std::unique_ptr

components/metrics/serialization/serialization_utils.h

Index: components/metrics/serialization/serialization_utils.h
diff --git a/components/metrics/serialization/serialization_utils.h b/components/metrics/serialization/serialization_utils.h
index 17e5e4cebc550d654296413448af4d6e00ec6b67..202f89c8aad247a76bd094d2c06c12bbc5a7a507 100644
--- a/components/metrics/serialization/serialization_utils.h
+++ b/components/metrics/serialization/serialization_utils.h
@@ -5,9 +5,9 @@
 #ifndef COMPONENTS_METRICS_SERIALIZATION_SERIALIZATION_UTILS_H_
 #define COMPONENTS_METRICS_SERIALIZATION_SERIALIZATION_UTILS_H_
 
+#include <memory>
 #include <string>
 
-#include "base/memory/scoped_ptr.h"
 #include "base/memory/scoped_vector.h"
 
 namespace metrics {
@@ -21,7 +21,7 @@ namespace SerializationUtils {
 // Deserializes a sample passed as a string and return a sample.
 // The return value will either be a scoped_ptr to a Metric sample (if the
 // deserialization was successful) or a NULL scoped_ptr.
-scoped_ptr<MetricSample> ParseSample(const std::string& sample);
+std::unique_ptr<MetricSample> ParseSample(const std::string& sample);
 
 // Reads all samples from a file and truncate the file when done.
 void ReadAndTruncateMetricsFromFile(const std::string& filename,