Remove SkUnitMappers from skia_gn_files.gypi

skia/skia_gn_files.gypi

 # This file is read into the GN build.
 
 # Files are relative to third_party/skia.
 {
   'skia_library_sources': [
     '<(skia_src_path)/core/SkFlate.cpp',  # this should likely be moved into src/utils in skia
 
     '<(skia_include_path)/images/SkImageRef_GlobalPool.h',
     '<(skia_include_path)/images/SkImageRef.h',
     '<(skia_include_path)/images/SkMovie.h',
@@ skipping 85 matching lines @@
     '<(skia_src_path)/utils/SkThreadUtils.h',
     '<(skia_src_path)/utils/SkThreadUtils_pthread.cpp',
     '<(skia_src_path)/utils/SkThreadUtils_pthread.h',
     '<(skia_src_path)/utils/SkThreadUtils_pthread_linux.cpp',
     '<(skia_src_path)/utils/SkThreadUtils_pthread_mach.cpp',
     '<(skia_src_path)/utils/SkThreadUtils_pthread_other.cpp',
     '<(skia_src_path)/utils/SkThreadUtils_win.cpp',
     '<(skia_src_path)/utils/SkThreadUtils_win.h',
     '<(skia_src_path)/utils/SkTFitsIn.h',
     '<(skia_src_path)/utils/SkTLogic.h',
-    '<(skia_src_path)/utils/SkUnitMappers.cpp',
 
     #mac
     '<(skia_include_path)/utils/mac/SkCGUtils.h',
     '<(skia_src_path)/utils/mac/SkCreateCGImageRef.cpp',
     '<(skia_src_path)/utils/mac/SkStream_mac.cpp',
 
     #windows
     '<(skia_include_path)/utils/win/SkAutoCoInitialize.h',
     '<(skia_include_path)/utils/win/SkHRESULT.h',
     '<(skia_include_path)/utils/win/SkIStream.h',
     '<(skia_include_path)/utils/win/SkTScopedComPtr.h',
     '<(skia_src_path)/utils/win/SkAutoCoInitialize.cpp',
     '<(skia_src_path)/utils/win/SkDWrite.h',
     '<(skia_src_path)/utils/win/SkDWrite.cpp',
     '<(skia_src_path)/utils/win/SkDWriteFontFileStream.cpp',
     '<(skia_src_path)/utils/win/SkDWriteFontFileStream.h',
     '<(skia_src_path)/utils/win/SkDWriteGeometrySink.cpp',
     '<(skia_src_path)/utils/win/SkDWriteGeometrySink.h',
     '<(skia_src_path)/utils/win/SkHRESULT.cpp',
     '<(skia_src_path)/utils/win/SkIStream.cpp',
     '<(skia_src_path)/utils/win/SkWGL_win.cpp',
 
     #testing
     '<(skia_src_path)/fonts/SkGScalerContext.cpp',
     '<(skia_src_path)/fonts/SkGScalerContext.h',
   ],
 }