remove flags that are now in chrome's SkUserConfig.h

R=reed@google.com
NOTRY=True

Author: reed@chromium.org

Review URL: https://codereview.chromium.org/367483003
diff --git a/gyp/skia_for_chromium_defines.gypi b/gyp/skia_for_chromium_defines.gypi
index 967e1ff..93674ef 100644
--- a/gyp/skia_for_chromium_defines.gypi
+++ b/gyp/skia_for_chromium_defines.gypi
@@ -15,10 +15,6 @@
     'skia_for_chromium_defines': [
       'SK_SUPPORT_LEGACY_PICTURE_CLONE',
       'SK_SUPPORT_LEGACY_GETDEVICE',
-      'SK_SUPPORT_LEGACY_GETTOPDEVICE',
-      'SK_SUPPORT_LEGACY_BITMAP_CONFIG',
-      'SK_SUPPORT_LEGACY_N32_NAME',
-      'SK_SUPPORT_LEGACY_SETCONFIG',
       'SK_IGNORE_ETC1_SUPPORT',
       'SK_IGNORE_GPU_DITHER',
     ],