Revert of Switch cc::RollingTimeDeltaHistory to use a vector

cc/base/rolling_time_delta_history.h

Index: cc/base/rolling_time_delta_history.h
diff --git a/cc/base/rolling_time_delta_history.h b/cc/base/rolling_time_delta_history.h
index 192c8e077d4de18c58e24cd55ac1989a9bd494e6..61ed339f74038ca8336769a9758a59641b79cba2 100644
--- a/cc/base/rolling_time_delta_history.h
+++ b/cc/base/rolling_time_delta_history.h
@@ -7,7 +7,8 @@
 
 #include <stddef.h>
 
-#include <vector>
+#include <deque>
+#include <set>
 
 #include "base/macros.h"
 #include "base/time/time.h"
@@ -32,8 +33,10 @@
   base::TimeDelta Percentile(double percent) const;
 
  private:
-  std::vector<base::TimeDelta> sample_vector_;
-  size_t next_index_;
+  typedef std::multiset<base::TimeDelta> TimeDeltaMultiset;
+
+  TimeDeltaMultiset sample_set_;
+  std::deque<TimeDeltaMultiset::iterator> chronological_sample_deque_;
   size_t max_size_;
 
   DISALLOW_COPY_AND_ASSIGN(RollingTimeDeltaHistory);