Even more win64 warning fixes

Review URL: https://codereview.chromium.org/800993002
diff --git a/tests/ScalarTest.cpp b/tests/ScalarTest.cpp
index b6f71d1..f2f924e 100644
--- a/tests/ScalarTest.cpp
+++ b/tests/ScalarTest.cpp
@@ -54,7 +54,7 @@
 
     static const struct {
         const SkPoint* fPts;
-        size_t         fCount;
+        int            fCount;
         bool           fIsFinite;
     } gSets[] = {
         { gF0, SK_ARRAY_COUNT(gF0), true },