Remove old DCHECK from ~PepperStreamChannel().

remoting/protocol/pepper_stream_channel.cc

Index: remoting/protocol/pepper_stream_channel.cc
diff --git a/remoting/protocol/pepper_stream_channel.cc b/remoting/protocol/pepper_stream_channel.cc
index 48d3a33f6c1954101fbd8718688b329cf074ca02..477f9fa35cd9f02f046fce770f083dc1c2f4536e 100644
--- a/remoting/protocol/pepper_stream_channel.cc
+++ b/remoting/protocol/pepper_stream_channel.cc
@@ -50,8 +50,6 @@ PepperStreamChannel::PepperStreamChannel(
 
 PepperStreamChannel::~PepperStreamChannel() {
   session_->OnDeleteChannel(this);
-  // Verify that the |channel_| is ether destroyed or we own it.
-  DCHECK_EQ(channel_, owned_channel_.get());
   // Channel should be already destroyed if we were connected.
   DCHECK(!connected_ || channel_ == NULL);
 }