Partial revert of https://codereview.chromium.org/1738913002/ (Enable RAW codec for Windows)

gyp/common_variables.gypi

Index: gyp/common_variables.gypi
diff --git a/gyp/common_variables.gypi b/gyp/common_variables.gypi
index e26939f864f6212867bb41f4c13b50e0c2d8fc34..0688f627b9b20647d3d15b677b3f2e75860f69a9 100644
--- a/gyp/common_variables.gypi
+++ b/gyp/common_variables.gypi
@@ -53,15 +53,19 @@
         'skia_os%': '<(skia_os)',
         'vulkan_merged_into_skia': '1',
         'skia_android_framework%': 0,
-        # RAW codec needs exceptions. Due to that, it is a separate target. Its usage can be
-        # controlled by skia_codec_decodes_raw.
-        'skia_codec_decodes_raw%': 1,
         'conditions' : [
           [ 'skia_os in ["linux", "freebsd", "openbsd", "solaris", "mac"]', {
             'skia_arch_type%': 'x86_64',
           }, {
             'skia_arch_type%': 'x86',
           }],
+          # RAW codec needs exceptions. Due to that, it is a separate target. Its usage can be
+          # controlled by skia_codec_decodes_raw.
+          ['skia_os == "win"', {
+            'skia_codec_decodes_raw%' : 0,
+          }, {
+            'skia_codec_decodes_raw%' : 1,
+          }],
         ],
         'arm_version%': 0,
         'arm_neon%': 0,