Cleanup: Get rid of make_isize() function from gm.h.

gm/quadpaths.cpp

Index: gm/quadpaths.cpp
diff --git a/gm/quadpaths.cpp b/gm/quadpaths.cpp
index decf50a96edaf54a8f5f5f6919d2a80413f281e3..f21fdd98e1496725943cb1da3022cbbcac628373 100644
--- a/gm/quadpaths.cpp
+++ b/gm/quadpaths.cpp
@@ -24,7 +24,7 @@ protected:
         return SkString("quadpath");
     }
 
-    SkISize onISize() { return make_isize(1240, 390); }
+    SkISize onISize() { return SkISize::Make(1240, 390); }
 
     void drawPath(SkPath& path,SkCanvas* canvas,SkColor color,
                   const SkRect& clip,SkPaint::Cap cap, SkPaint::Join join,
@@ -170,7 +170,7 @@ protected:
         return SkString("quadclosepath");
     }
 
-    SkISize onISize() { return make_isize(1240, 390); }
+    SkISize onISize() { return SkISize::Make(1240, 390); }
 
     void drawPath(SkPath& path,SkCanvas* canvas,SkColor color,
                   const SkRect& clip,SkPaint::Cap cap, SkPaint::Join join,