Convert Pass()→std::move() in //net

net/base/backoff_entry_serializer.cc

Index: net/base/backoff_entry_serializer.cc
diff --git a/net/base/backoff_entry_serializer.cc b/net/base/backoff_entry_serializer.cc
index 1467553182b155a57a113200b804f665b9e74c7e..e7366851f7c0413f301b9a3063eaae60fdfe20a5 100644
--- a/net/base/backoff_entry_serializer.cc
+++ b/net/base/backoff_entry_serializer.cc
@@ -4,6 +4,8 @@
 
 #include "net/base/backoff_entry_serializer.h"
 
+#include <utility>
+
 #include "base/strings/string_number_conversions.h"
 #include "base/time/tick_clock.h"
 #include "base/values.h"
@@ -34,7 +36,7 @@ scoped_ptr<base::Value> BackoffEntrySerializer::SerializeToValue(
   serialized->AppendString(
       base::Int64ToString(absolute_release_time.ToInternalValue()));
 
-  return serialized.Pass();
+  return std::move(serialized);
 }
 
 scoped_ptr<BackoffEntry> BackoffEntrySerializer::DeserializeFromValue(