Revert of Add support for converting I420 software frames into NV12 hardware frames

media/base/video_frame.cc

Index: media/base/video_frame.cc
diff --git a/media/base/video_frame.cc b/media/base/video_frame.cc
index 3fac954d5a6a3fbccb870c4254313bdbc0b3aa2c..94264790c2b29c085b070f5735ecc73d146e5e17 100644
--- a/media/base/video_frame.cc
+++ b/media/base/video_frame.cc
@@ -236,9 +236,7 @@
     const gfx::Rect& visible_rect,
     const gfx::Size& natural_size,
     base::TimeDelta timestamp) {
-  if (format != PIXEL_FORMAT_ARGB &&
-      format != PIXEL_FORMAT_UYVY &&
-      format != PIXEL_FORMAT_NV12) {
+  if (format != PIXEL_FORMAT_ARGB && format != PIXEL_FORMAT_UYVY) {
     DLOG(ERROR) << "Unsupported pixel format supported, got "
                 << VideoPixelFormatToString(format);
     return nullptr;