Replace scoped_ptr with unique_ptr in talk/

talk/app/webrtc/objc/RTCDataChannel.mm

Index: talk/app/webrtc/objc/RTCDataChannel.mm
diff --git a/talk/app/webrtc/objc/RTCDataChannel.mm b/talk/app/webrtc/objc/RTCDataChannel.mm
index 00d51b10eeac6009edfa534915a5a2192ba7c005..114b916fb467e1c7255464242853e5783d83e48e 100644
--- a/talk/app/webrtc/objc/RTCDataChannel.mm
+++ b/talk/app/webrtc/objc/RTCDataChannel.mm
@@ -31,8 +31,9 @@
 
 #import "RTCDataChannel+Internal.h"
 
+#include <memory>
+
 #include "webrtc/api/datachannelinterface.h"
-#include "webrtc/base/scoped_ptr.h"
 
 namespace webrtc {
 
@@ -146,7 +147,7 @@ std::string StdStringFromNSString(NSString* nsString) {
 @end
 
 @implementation RTCDataBuffer {
-  rtc::scoped_ptr<webrtc::DataBuffer> _dataBuffer;
+  std::unique_ptr<webrtc::DataBuffer> _dataBuffer;
 }
 
 - (instancetype)initWithData:(NSData*)data isBinary:(BOOL)isBinary {
@@ -187,7 +188,7 @@ std::string StdStringFromNSString(NSString* nsString) {
 
 @implementation RTCDataChannel {
   rtc::scoped_refptr<webrtc::DataChannelInterface> _dataChannel;
-  rtc::scoped_ptr<webrtc::RTCDataChannelObserver> _observer;
+  std::unique_ptr<webrtc::RTCDataChannelObserver> _observer;
   BOOL _isObserverRegistered;
 }