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

components/rappor/sampler.cc

Index: components/rappor/sampler.cc
diff --git a/components/rappor/sampler.cc b/components/rappor/sampler.cc
index 9ad0da95880e8d6f37a9dc60af46e8b694c2fdb4..b6a809807c8e0f65bb7403d02baee0d70abd1ab2 100644
--- a/components/rappor/sampler.cc
+++ b/components/rappor/sampler.cc
@@ -19,7 +19,7 @@ Sampler::Sampler() {}
 Sampler::~Sampler() {}
 
 void Sampler::AddSample(const std::string& metric_name,
-                        scoped_ptr<Sample> sample) {
+                        std::unique_ptr<Sample> sample) {
   ++sample_counts_[metric_name];
   // Replace the previous sample with a 1 in sample_count_ chance so that each
   // sample has equal probability of being reported.