Fix #define for distance field fonts

R=robertphillips@google.com

Author: jvanverth@google.com

Review URL: https://codereview.chromium.org/108413002

git-svn-id: http://skia.googlecode.com/svn/trunk/gyp@12536 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/common_conditions.gypi b/common_conditions.gypi
index 8d8ae14..83bc561 100644
--- a/common_conditions.gypi
+++ b/common_conditions.gypi
@@ -5,7 +5,7 @@
     'SK_ALLOW_STATIC_GLOBAL_INITIALIZERS=<(skia_static_initializers)',
     'SK_SUPPORT_GPU=<(skia_gpu)',
     'SK_SUPPORT_OPENCL=<(skia_opencl)',
-    'SK_DISTANCEFIELD_FONTSC=<(skia_distancefield_fonts)',
+    'SK_DISTANCEFIELD_FONTS=<(skia_distancefield_fonts)',
   ],
   'conditions' : [
     [ 'skia_os == "win"',