This reverts commit a8aa921c.

Reason for revert: breaks a webrtc unittest on Windows.

https://bugs.chromium.org/p/webrtc/issues/detail?id=9263&can=2&start=0&num=100&q=&colspec=ID%20Pri%20M%20ReleaseBlock%20Component%20Status%20Owner%20Summary&groupby=&sort=

Original change's description:
> Allow negative height when ConvertToI420/ARGB is called with NV12/NV21
> 
> ConvertToI420 and ConvertToARGB support the use of a negative height
> parameter to flip the image vertically. When converting from NV12 or
> NV21 this parameter was misinterpreted, resulting in invalid output.
> This CL introduces the use of abs_src_height to correctly calculate
> the location of the source UV plane.
> 
> The sign of crop_height is not used, to reduce confusion ConvertToI420
> and ConvertToARGB no longer accept negative crop height.
> 
> Unit tests for Android420ToI420 are updated to fix miscalculation of
> src_stride_uv, fix incorrect pixel strides, and to test inversion.
> New unit tests are included to test inversion for ConvertToARGB,
> ConvertToI420, Android420ToARGB, and Android420ToABGR.
> For consistency the test NV12Crop is renamed ConvertToI420_NV12_Crop.
> 
> Bug: libyuv:446
> Test: out/Release/libyuv_unittest --gtest_filter=*.ConvertTo*:*.Android420To*
> Change-Id: Idc98e62671cb30272cfa7e24fafbc8b73712f7c6
> Reviewed-on: https://chromium-review.googlesource.com/994074
> Commit-Queue: Frank Barchard <fbarchard@chromium.org>
> Reviewed-by: Frank Barchard <fbarchard@chromium.org>

TBR=fbarchard@chromium.org,robert@bares.me

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: libyuv:446, chromium:9263, libyuv:801
Change-Id: I7c55b3fcb477f9754c249b9c2c54b24da2c29283
Reviewed-on: https://chromium-review.googlesource.com/1081267Reviewed-by: Frank Barchard <fbarchard@chromium.org>
Reviewed-by: Weiyong Yao <braveyao@chromium.org>
Commit-Queue: Frank Barchard <fbarchard@chromium.org>