Delete unused and almost unused frame-related methods.

webrtc/common_video/corevideo_frame_buffer.cc

Index: webrtc/common_video/corevideo_frame_buffer.cc
diff --git a/webrtc/common_video/corevideo_frame_buffer.cc b/webrtc/common_video/corevideo_frame_buffer.cc
index 55dc00da858b9eaae93961cb38359502d0da4041..a58ddc7fbb9307acf694f2cab4a1293e09af7ca9 100644
--- a/webrtc/common_video/corevideo_frame_buffer.cc
+++ b/webrtc/common_video/corevideo_frame_buffer.cc
@@ -46,9 +46,9 @@ CoreVideoFrameBuffer::NativeToI420Buffer() {
   int src_uv_stride = CVPixelBufferGetBytesPerRowOfPlane(pixel_buffer_, 1);
   int ret = libyuv::NV12ToI420(
       src_y, src_y_stride, src_uv, src_uv_stride,
-      buffer->MutableData(webrtc::kYPlane), buffer->stride(webrtc::kYPlane),
-      buffer->MutableData(webrtc::kUPlane), buffer->stride(webrtc::kUPlane),
-      buffer->MutableData(webrtc::kVPlane), buffer->stride(webrtc::kVPlane),
+      buffer->MutableDataY(), buffer->StrideY(),
+      buffer->MutableDataU(), buffer->StrideU(),
+      buffer->MutableDataV(), buffer->StrideV(),
       width, height);
   CVPixelBufferUnlockBaseAddress(pixel_buffer_, kCVPixelBufferLock_ReadOnly);
   if (ret) {