Cleanup of component/metrics for GN.

components/metrics/serialization/metric_sample.cc

Index: components/metrics/serialization/metric_sample.cc
diff --git a/components/metrics/serialization/metric_sample.cc b/components/metrics/serialization/metric_sample.cc
index 5d7d1fc717bf620cfafb9c1705f2d436b59cba0d..107fc3e0d80f5a8b79432179fe2c2d27159419a0 100644
--- a/components/metrics/serialization/metric_sample.cc
+++ b/components/metrics/serialization/metric_sample.cc
@@ -74,25 +74,25 @@ std::string MetricSample::ToString() const {
   }
 }
 
-const int MetricSample::sample() const {
+int MetricSample::sample() const {
   CHECK_NE(type_, USER_ACTION);
   CHECK_NE(type_, CRASH);
   return sample_;
 }
 
-const int MetricSample::min() const {
+int MetricSample::min() const {
   CHECK_EQ(type_, HISTOGRAM);
   return min_;
 }
 
-const int MetricSample::max() const {
+int MetricSample::max() const {
   CHECK_NE(type_, CRASH);
   CHECK_NE(type_, USER_ACTION);
   CHECK_NE(type_, SPARSE_HISTOGRAM);
   return max_;
 }
 
-const int MetricSample::bucket_count() const {
+int MetricSample::bucket_count() const {
   CHECK_EQ(type_, HISTOGRAM);
   return bucket_count_;
 }