Move all api/ files to use webrtc::RefCountInterface

instead of rtc::RefCountInterface

Bug: webrtc:15622
Change-Id: I085660a097a019c7aa58a7e3f0aceeedd9fcc8c0
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/325460
Commit-Queue: Harald Alvestrand <hta@webrtc.org>
Reviewed-by: Tomas Gunnarsson <tommi@webrtc.org>
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#41050}

api/jsep.h

diff --git a/api/jsep.h b/api/jsep.h
index d2aa57c..643a99d 100644
--- a/api/jsep.h
+++ b/api/jsep.h
@@ -27,8 +27,8 @@
 #include <vector>
 
 #include "absl/types/optional.h"
+#include "api/ref_count.h"
 #include "api/rtc_error.h"
-#include "rtc_base/ref_count.h"
 #include "rtc_base/system/rtc_export.h"
 
 namespace cricket {
@@ -219,7 +219,7 @@
 
 // CreateOffer and CreateAnswer callback interface.
 class RTC_EXPORT CreateSessionDescriptionObserver
-    : public rtc::RefCountInterface {
+    : public webrtc::RefCountInterface {
  public:
   // This callback transfers the ownership of the `desc`.
   // TODO(deadbeef): Make this take an std::unique_ptr<> to avoid confusion
@@ -238,7 +238,8 @@
 };
 
 // SetLocalDescription and SetRemoteDescription callback interface.
-class RTC_EXPORT SetSessionDescriptionObserver : public rtc::RefCountInterface {
+class RTC_EXPORT SetSessionDescriptionObserver
+    : public webrtc::RefCountInterface {
  public:
   virtual void OnSuccess() = 0;
   // See description in CreateSessionDescriptionObserver for OnFailure.