Update SPDY4 settings ID to 16 bits (from 8).

net/spdy/spdy_protocol.cc

Index: net/spdy/spdy_protocol.cc
diff --git a/net/spdy/spdy_protocol.cc b/net/spdy/spdy_protocol.cc
index fd435122f6485d5397f721aee2c63c5b946bebe2..6b55b11ea945e09e34029e8c4d30dc430041d03a 100644
--- a/net/spdy/spdy_protocol.cc
+++ b/net/spdy/spdy_protocol.cc
@@ -733,6 +733,10 @@ size_t SpdyConstants::GetSizeOfSizeField(SpdyMajorVersion version) {
   return (version < SPDY3) ? sizeof(uint16) : sizeof(uint32);
 }
 
+size_t SpdyConstants::GetSettingSize(SpdyMajorVersion version) {
+  return version <= SPDY3 ? 8 : 6;
+}
+
 void SpdyDataIR::Visit(SpdyFrameVisitor* visitor) const {
   return visitor->VisitData(*this);
 }