undef fontmetrics flag -- rely on clients to opt in

Bug: skia:
Change-Id: Icc43da90659c47e3499a67babc5696651dcf004d
Reviewed-on: https://skia-review.googlesource.com/c/177346
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>
diff --git a/include/core/SkPaint.h b/include/core/SkPaint.h
index f2ccae6..d06fb02 100644
--- a/include/core/SkPaint.h
+++ b/include/core/SkPaint.h
@@ -27,10 +27,6 @@
 #include "SkMatrix.h"
 #include "SkRefCnt.h"
 
-#ifndef SK_SUPPORT_LEGACY_FONTMETRICS_IN_PAINT
-#define SK_SUPPORT_LEGACY_FONTMETRICS_IN_PAINT
-#endif
-
 class GrTextBlob;
 class SkAutoDescriptor;
 class SkColorFilter;