Fix BufferedSocketWriter to buffer everything before it starts writing.

remoting/protocol/channel_dispatcher_base.cc

Index: remoting/protocol/channel_dispatcher_base.cc
diff --git a/remoting/protocol/channel_dispatcher_base.cc b/remoting/protocol/channel_dispatcher_base.cc
index bbdd0c5d1796776ed39516cb8dd7b7b7a117027e..cd0823b2835b467a4aed4bdff3ed4316d7c65d3b 100644
--- a/remoting/protocol/channel_dispatcher_base.cc
+++ b/remoting/protocol/channel_dispatcher_base.cc
@@ -42,7 +42,7 @@ void ChannelDispatcherBase::OnChannelReady(
 
   channel_factory_ = nullptr;
   channel_ = std::move(socket);
-  writer_.Init(
+  writer_.Start(
       base::Bind(&P2PStreamSocket::Write, base::Unretained(channel_.get())),
       base::Bind(&ChannelDispatcherBase::OnReadWriteFailed,
                  base::Unretained(this)));