Misc truncation fixes for gn builds with VS 2015

content/browser/renderer_host/p2p/socket_host_tcp.cc

Index: content/browser/renderer_host/p2p/socket_host_tcp.cc
diff --git a/content/browser/renderer_host/p2p/socket_host_tcp.cc b/content/browser/renderer_host/p2p/socket_host_tcp.cc
index cb4d60de69a4270759c7ff086c364589a98d5de0..cb6d3948e11b064334b4ddf67c14537265038ef4 100644
--- a/content/browser/renderer_host/p2p/socket_host_tcp.cc
+++ b/content/browser/renderer_host/p2p/socket_host_tcp.cc
@@ -522,7 +522,8 @@ void P2PSocketHostTcp::DoSend(const net::IPEndPoint& to,
   int size = kPacketHeaderSize + data.size();
   scoped_refptr<net::DrainableIOBuffer> buffer =
       new net::DrainableIOBuffer(new net::IOBuffer(size), size);
-  *reinterpret_cast<uint16*>(buffer->data()) = base::HostToNet16(data.size());
+  *reinterpret_cast<uint16*>(buffer->data()) =
+      base::HostToNet16(static_cast<uint16>(data.size()));
   memcpy(buffer->data() + kPacketHeaderSize, &data[0], data.size());
 
   packet_processing_helpers::ApplyPacketOptions(