Revert of Delete webrtc::VideoFrame methods buffer and stride.

webrtc/api/java/jni/androidmediaencoder_jni.cc

Index: webrtc/api/java/jni/androidmediaencoder_jni.cc
diff --git a/webrtc/api/java/jni/androidmediaencoder_jni.cc b/webrtc/api/java/jni/androidmediaencoder_jni.cc
index 8c990deb5a950b3aef51db0d96d3d30e91e8c855..5a817b6e8446ed3bca12bce62ab0dc6b5be326b2 100644
--- a/webrtc/api/java/jni/androidmediaencoder_jni.cc
+++ b/webrtc/api/java/jni/androidmediaencoder_jni.cc
@@ -795,12 +795,9 @@
   CHECK_EXCEPTION(jni);
   RTC_CHECK(yuv_buffer) << "Indirect buffer??";
   RTC_CHECK(!libyuv::ConvertFromI420(
-      frame.video_frame_buffer()->DataY(),
-      frame.video_frame_buffer()->StrideY(),
-      frame.video_frame_buffer()->DataU(),
-      frame.video_frame_buffer()->StrideU(),
-      frame.video_frame_buffer()->DataV(),
-      frame.video_frame_buffer()->StrideV(),
+      frame.buffer(webrtc::kYPlane), frame.stride(webrtc::kYPlane),
+      frame.buffer(webrtc::kUPlane), frame.stride(webrtc::kUPlane),
+      frame.buffer(webrtc::kVPlane), frame.stride(webrtc::kVPlane),
       yuv_buffer, width_, width_, height_, encoder_fourcc_))
       << "ConvertFromI420 failed";