Mips memcpy moved to row_mips.

BUG=191
TEST=none
Review URL: https://webrtc-codereview.appspot.com/1127005

git-svn-id: http://libyuv.googlecode.com/svn/trunk@580 16f28f9a-4ce2-e073-06de-1de4eb20be90

libyuv.gyp

@@ -75,7 +75,6 @@
         'source/convert_from_argb.cc',
         'source/cpu_id.cc',
         'source/format_conversion.cc',
-        'source/memcpy_mips.S',  # TODO(fbarchard): Move into row_mips.cc
         'source/mjpeg_decoder.cc',
         'source/planar_functions.cc',
         'source/rotate.cc',