Replace left over WebString/WebVector use in modules/peerconnection

Now, only cases actually needed (or logical) and test code still
uses these containers in modules/peerconnection. Production code
has been migrated.

BUG=787254
R=haraken@chromium.org

Change-Id: I40e76739853ae99475ed9ef0ecf2f7243011827c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1992280
Commit-Queue: Antonio Gomes <tonikitoo@igalia.com>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#729708}

third_party/blink/renderer/modules/peerconnection/rtc_dtmf_sender.cc

@@ -142,7 +142,7 @@ void RTCDTMFSender::PlayoutTask() {
     DispatchEvent(*event.Release());
     return;
   }
-  WebString this_tone = tone_buffer_.Substring(0, 1);
+  String this_tone = tone_buffer_.Substring(0, 1);
   tone_buffer_ = tone_buffer_.Substring(1, tone_buffer_.length() - 1);
   // InsertDTMF handles both tones and ",", and calls DidPlayTone after
   // the specified delay.

third_party/blink/renderer/modules/peerconnection/rtc_ice_transport.cc

@@ -318,7 +318,7 @@ static cricket::IceParameters ConvertIceParameters(
 
 static WebVector<webrtc::PeerConnectionInterface::IceServer> ConvertIceServers(
     const HeapVector<Member<RTCIceServer>>& ice_servers) {
-  Vector<webrtc::PeerConnectionInterface::IceServer> converted_ice_servers;
+  WebVector<webrtc::PeerConnectionInterface::IceServer> converted_ice_servers;
   for (const RTCIceServer* ice_server : ice_servers) {
     converted_ice_servers.emplace_back(ConvertIceServer(ice_server));
   }

third_party/blink/renderer/modules/peerconnection/rtc_rtp_sender.cc

@@ -394,7 +394,7 @@ RTCRtpSendParameters* RTCRtpSender::getParameters() {
     // TODO(orphis): Forward missing fields from the WebRTC library:
     // codecPayloadType, dtx, ptime, maxFramerate, scaleResolutionDownBy.
     RTCRtpEncodingParameters* encoding = RTCRtpEncodingParameters::Create();
-    encoding->setRid(WebString::FromUTF8(webrtc_encoding.rid));
+    encoding->setRid(String::FromUTF8(webrtc_encoding.rid));
     encoding->setActive(webrtc_encoding.active);
     if (webrtc_encoding.max_bitrate_bps) {
       encoding->setMaxBitrate(webrtc_encoding.max_bitrate_bps.value());

third_party/blink/renderer/modules/peerconnection/rtc_stats_report.cc

@@ -27,7 +27,7 @@ v8::Local<v8::Value> RTCStatsToValue(ScriptState* script_state,
     std::unique_ptr<RTCStatsMember> member = stats->GetMember(i);
     if (!member->IsDefined())
       continue;
-    WebString name = member->GetName();
+    String name = member->GetName();
     switch (member->GetType()) {
       case webrtc::RTCStatsMemberInterface::kBool:
         builder.AddBoolean(name, member->ValueBool());