Fix "value possibly truncated" warnings on MSVC, net/spdy/ edition.

net/spdy/fuzzing/hpack_fuzz_util.cc

Index: net/spdy/fuzzing/hpack_fuzz_util.cc
diff --git a/net/spdy/fuzzing/hpack_fuzz_util.cc b/net/spdy/fuzzing/hpack_fuzz_util.cc
index 58f2ec1430d06e2acc19477e5307abe94335093c..29604fe35fa60098efbcc4800d83be9ab6110c25 100644
--- a/net/spdy/fuzzing/hpack_fuzz_util.cc
+++ b/net/spdy/fuzzing/hpack_fuzz_util.cc
@@ -107,7 +107,8 @@ map<string, string> HpackFuzzUtil::NextGeneratedHeaderSet(
 
 // static
 size_t HpackFuzzUtil::SampleExponential(size_t mean, size_t sanity_bound) {
-  return std::min<size_t>(-std::log(base::RandDouble()) * mean, sanity_bound);
+  return std::min(static_cast<size_t>(-std::log(base::RandDouble()) * mean),
+                  sanity_bound);
 }
 
 // static