Revert of Delete unused and almost unused frame-related methods. (patchset #12 id:220001 of https://codereview.webrtc.org/2065733003/ )

Reason for revert:
Breaks downstream applications which inherits webrtc::VideoFrameBuffer and tries to override deleted methods data(), stride() and MutableData().

Original issue's description:
> Delete unused and almost unused frame-related methods.
>
> webrtc::VideoFrame::set_video_frame_buffer
> webrtc::VideoFrame::ConvertNativeToI420Frame
>
> cricket::WebRtcVideoFrame::InitToBlack
>
> VideoFrameBuffer::data
> VideoFrameBuffer::stride
> VideoFrameBuffer::MutableData
>
> TBR=tkchin@webrtc.org # Refactoring affecting RTCVideoFrame
> BUG=webrtc:5682
>
> Committed: https://crrev.com/76270de4bc2dac188f10f805e6e2fb86693ef864
> Cr-Commit-Position: refs/heads/master@{#13183}

TBR=perkj@webrtc.org,pbos@webrtc.org,marpan@webrtc.org,tkchin@webrtc.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=webrtc:5682

Review-Url: https://codereview.webrtc.org/2076113002
Cr-Commit-Position: refs/heads/master@{#13184}
diff --git a/webrtc/api/java/jni/androidmediadecoder_jni.cc b/webrtc/api/java/jni/androidmediadecoder_jni.cc
index 2ec222f..3793756 100644
--- a/webrtc/api/java/jni/androidmediadecoder_jni.cc
+++ b/webrtc/api/java/jni/androidmediadecoder_jni.cc
@@ -794,12 +794,12 @@
       libyuv::I420Copy(y_ptr, stride,
                        u_ptr, uv_stride,
                        v_ptr, uv_stride,
-                       frame_buffer->MutableDataY(),
-                       frame_buffer->StrideY(),
-                       frame_buffer->MutableDataU(),
-                       frame_buffer->StrideU(),
-                       frame_buffer->MutableDataV(),
-                       frame_buffer->StrideV(),
+                       frame_buffer->MutableData(webrtc::kYPlane),
+                       frame_buffer->stride(webrtc::kYPlane),
+                       frame_buffer->MutableData(webrtc::kUPlane),
+                       frame_buffer->stride(webrtc::kUPlane),
+                       frame_buffer->MutableData(webrtc::kVPlane),
+                       frame_buffer->stride(webrtc::kVPlane),
                        width, height);
     } else {
       // All other supported formats are nv12.
@@ -808,12 +808,12 @@
       libyuv::NV12ToI420(
           y_ptr, stride,
           uv_ptr, stride,
-          frame_buffer->MutableDataY(),
-          frame_buffer->StrideY(),
-          frame_buffer->MutableDataU(),
-          frame_buffer->StrideU(),
-          frame_buffer->MutableDataV(),
-          frame_buffer->StrideV(),
+          frame_buffer->MutableData(webrtc::kYPlane),
+          frame_buffer->stride(webrtc::kYPlane),
+          frame_buffer->MutableData(webrtc::kUPlane),
+          frame_buffer->stride(webrtc::kUPlane),
+          frame_buffer->MutableData(webrtc::kVPlane),
+          frame_buffer->stride(webrtc::kVPlane),
           width, height);
     }
     // Return output byte buffer back to codec.