Fix test expectations to use bool checks rather than null compares

remoting/protocol/fake_datagram_socket.cc

Index: remoting/protocol/fake_datagram_socket.cc
diff --git a/remoting/protocol/fake_datagram_socket.cc b/remoting/protocol/fake_datagram_socket.cc
index 87713eb14fbe3448f8e0561c7515477400c06be1..91eedb6f8bebed7852593517424eca2cc3acc719 100644
--- a/remoting/protocol/fake_datagram_socket.cc
+++ b/remoting/protocol/fake_datagram_socket.cc
@@ -137,7 +137,7 @@ FakeDatagramChannelFactory::FakeDatagramChannelFactory()
 FakeDatagramChannelFactory::~FakeDatagramChannelFactory() {
   for (ChannelsMap::iterator it = channels_.begin(); it != channels_.end();
        ++it) {
-    EXPECT_TRUE(it->second == nullptr);
+    EXPECT_FALSE(it->second);
   }
 }
 
@@ -155,7 +155,7 @@ FakeDatagramSocket* FakeDatagramChannelFactory::GetFakeChannel(
 void FakeDatagramChannelFactory::CreateChannel(
     const std::string& name,
     const ChannelCreatedCallback& callback) {
-  EXPECT_TRUE(channels_[name] == nullptr);
+  EXPECT_FALSE(channels_[name]);
 
   std::unique_ptr<FakeDatagramSocket> channel(new FakeDatagramSocket());
   channels_[name] = channel->GetWeakPtr();