use SkFontMetrics so we can deprecated the typedef

Bug: skia:
Change-Id: Icd40c042b0a8251bbd0b39dd3ee1a4634fff379f
Reviewed-on: https://skia-review.googlesource.com/c/170344
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>
diff --git a/gm/scaledemoji_rendering.cpp b/gm/scaledemoji_rendering.cpp
index 9ab8e55..6b75dc8 100644
--- a/gm/scaledemoji_rendering.cpp
+++ b/gm/scaledemoji_rendering.cpp
@@ -46,7 +46,7 @@
             SkPaint paint;
             paint.setTypeface(typeface);
             const char* text = sk_tool_utils::emoji_sample_text();
-            SkPaint::FontMetrics metrics;
+            SkFontMetrics metrics;
 
             for (SkScalar textSize : { 70, 150 }) {
                 paint.setTextSize(textSize);