Get rid of unqualified std:: types.

webrtc/modules/remote_bitrate_estimator/test/bwe_test.cc

Index: webrtc/modules/remote_bitrate_estimator/test/bwe_test.cc
diff --git a/webrtc/modules/remote_bitrate_estimator/test/bwe_test.cc b/webrtc/modules/remote_bitrate_estimator/test/bwe_test.cc
index 13959fc0c5924d73f10f039bfb2105e79ee9ca7d..ca6563bdca856f2572b895254b0237c9ac2e0b99 100644
--- a/webrtc/modules/remote_bitrate_estimator/test/bwe_test.cc
+++ b/webrtc/modules/remote_bitrate_estimator/test/bwe_test.cc
@@ -136,7 +136,7 @@ void Link::AddPacketProcessor(PacketProcessor* processor,
 }
 
 void Link::RemovePacketProcessor(PacketProcessor* processor) {
-  for (vector<PacketProcessorRunner>::iterator it = processors_.begin();
+  for (std::vector<PacketProcessorRunner>::iterator it = processors_.begin();
        it != processors_.end(); ++it) {
     if (it->RunsProcessor(processor)) {
       processors_.erase(it);