Add MakeUnique from chromium and change StunMessage::AddAttribute to take a unique_ptr.

webrtc/p2p/base/relayserver_unittest.cc

Index: webrtc/p2p/base/relayserver_unittest.cc
diff --git a/webrtc/p2p/base/relayserver_unittest.cc b/webrtc/p2p/base/relayserver_unittest.cc
index 1d07a07c7fbf1866f857400e7d5f5d1dfb145501..0c98286af9507d6d097a824691becf38f9d9407a 100644
--- a/webrtc/p2p/base/relayserver_unittest.cc
+++ b/webrtc/p2p/base/relayserver_unittest.cc
@@ -146,29 +146,25 @@ class RelayServerTest : public testing::Test {
     return msg;
   }
   static void AddMagicCookieAttr(StunMessage* msg) {
-    StunByteStringAttribute* attr =
-        StunAttribute::CreateByteString(STUN_ATTR_MAGIC_COOKIE);
+    auto attr = StunAttribute::CreateByteString(STUN_ATTR_MAGIC_COOKIE);
     attr->CopyBytes(TURN_MAGIC_COOKIE_VALUE, sizeof(TURN_MAGIC_COOKIE_VALUE));
-    msg->AddAttribute(attr);
+    msg->AddAttribute(std::move(attr));
   }
   static void AddUsernameAttr(StunMessage* msg, const std::string& val) {
-    StunByteStringAttribute* attr =
-        StunAttribute::CreateByteString(STUN_ATTR_USERNAME);
+    auto attr = StunAttribute::CreateByteString(STUN_ATTR_USERNAME);
     attr->CopyBytes(val.c_str(), val.size());
-    msg->AddAttribute(attr);
+    msg->AddAttribute(std::move(attr));
   }
   static void AddLifetimeAttr(StunMessage* msg, int val) {
-    StunUInt32Attribute* attr =
-        StunAttribute::CreateUInt32(STUN_ATTR_LIFETIME);
+    auto attr = StunAttribute::CreateUInt32(STUN_ATTR_LIFETIME);
     attr->SetValue(val);
-    msg->AddAttribute(attr);
+    msg->AddAttribute(std::move(attr));
   }
   static void AddDestinationAttr(StunMessage* msg, const SocketAddress& addr) {
-    StunAddressAttribute* attr =
-        StunAttribute::CreateAddress(STUN_ATTR_DESTINATION_ADDRESS);
+    auto attr = StunAttribute::CreateAddress(STUN_ATTR_DESTINATION_ADDRESS);
     attr->SetIP(addr.ipaddr());
     attr->SetPort(addr.port());
-    msg->AddAttribute(attr);
+    msg->AddAttribute(std::move(attr));
   }
 
   std::unique_ptr<rtc::PhysicalSocketServer> pss_;
@@ -458,10 +454,9 @@ TEST_F(RelayServerTest, TestSendRaw) {
     AddUsernameAttr(req.get(), username_);
     AddDestinationAttr(req.get(), client2_addr);
 
-    StunByteStringAttribute* send_data =
-        StunAttribute::CreateByteString(STUN_ATTR_DATA);
+    auto send_data = StunAttribute::CreateByteString(STUN_ATTR_DATA);
     send_data->CopyBytes(msg1);
-    req->AddAttribute(send_data);
+    req->AddAttribute(std::move(send_data));
 
     Send1(req.get());
     EXPECT_EQ(msg1, ReceiveRaw2());
@@ -500,10 +495,9 @@ TEST_F(RelayServerTest, DISABLED_TestExpiration) {
   AddUsernameAttr(req.get(), username_);
   AddDestinationAttr(req.get(), client2_addr);
 
-  StunByteStringAttribute* data_attr =
-      StunAttribute::CreateByteString(STUN_ATTR_DATA);
+  auto data_attr = StunAttribute::CreateByteString(STUN_ATTR_DATA);
   data_attr->CopyBytes(msg1);
-  req->AddAttribute(data_attr);
+  req->AddAttribute(std::move(data_attr));
 
   Send1(req.get());
   res.reset(Receive1());