Remove SkMaxScalar and SkMinScalar

Use std::max and std::min instead

Change-Id: Icf3796609e5cb511687fb50bd31229ae4b6b9b39
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/268841
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
diff --git a/gm/convexpolyclip.cpp b/gm/convexpolyclip.cpp
index 31dc1d4..7298a95 100644
--- a/gm/convexpolyclip.cpp
+++ b/gm/convexpolyclip.cpp
@@ -39,7 +39,7 @@
 
     SkPoint     pt = { wScalar / 2, hScalar / 2 };
 
-    SkScalar    radius = 3 * SkMaxScalar(wScalar, hScalar);
+    SkScalar    radius = 3 * std::max(wScalar, hScalar);
 
     SkColor colors[] = {SK_ColorDKGRAY,
                         ToolUtils::color_to_565(0xFF222255),