Misc cleanup in net/spdy/core.

net/spdy/core/hpack/hpack_header_table.cc

Index: net/spdy/core/hpack/hpack_header_table.cc
diff --git a/net/spdy/core/hpack/hpack_header_table.cc b/net/spdy/core/hpack/hpack_header_table.cc
index 3dad08fb995c77a1a96a8e982b97494246750e7d..54bc3ea5295b73f624750061f1fe305fcb98e1bc 100644
--- a/net/spdy/core/hpack/hpack_header_table.cc
+++ b/net/spdy/core/hpack/hpack_header_table.cc
@@ -250,7 +250,7 @@ void HpackHeaderTable::DebugLogTableState() const {
     DVLOG(2) << "  " << it->GetDebugString();
   }
   DVLOG(2) << "Full Static Index:";
-  for (auto* entry : static_index_) {
+  for (const auto* entry : static_index_) {
     DVLOG(2) << "  " << entry->GetDebugString();
   }
   DVLOG(2) << "Full Static Name Index:";
@@ -258,7 +258,7 @@ void HpackHeaderTable::DebugLogTableState() const {
     DVLOG(2) << "  " << it.first << ": " << it.second->GetDebugString();
   }
   DVLOG(2) << "Full Dynamic Index:";
-  for (auto* entry : dynamic_index_) {
+  for (const auto* entry : dynamic_index_) {
     DVLOG(2) << "  " << entry->GetDebugString();
   }
   DVLOG(2) << "Full Dynamic Name Index:";