Update from https://crrev.com/306655

net/spdy/spdy_session.h

Index: net/spdy/spdy_session.h
diff --git a/net/spdy/spdy_session.h b/net/spdy/spdy_session.h
index 862918b00b49a0b9d582658fe9fcc93f94971b49..06dfae6e4d81fe098aff6ec8cf60a91e4bed4cca 100644
--- a/net/spdy/spdy_session.h
+++ b/net/spdy/spdy_session.h
@@ -511,6 +511,10 @@ class NET_EXPORT SpdySession : public BufferedSpdyFramerVisitorInterface,
     return buffered_spdy_framer_->GetDataFrameMaximumPayload();
   }
 
+  static int32 GetInitialWindowSize(NextProto protocol) {
+    return protocol < kProtoSPDY4MinimumVersion ? 65536 : 65535;
+  }
+
   // https://http2.github.io/http2-spec/#TLSUsage mandates minimum security
   // standards for TLS.
   bool HasAcceptableTransportSecurity() const;