Remove implicit flooring Scale() method from Point and Size.

ui/gfx/size_f.h

Index: ui/gfx/size_f.h
diff --git a/ui/gfx/size_f.h b/ui/gfx/size_f.h
index c377395c57d48d77a1a384db3c807a9eebd767db..f3ad7dbed9904aebb1aa9a1b52bba16623ef19ad 100644
--- a/ui/gfx/size_f.h
+++ b/ui/gfx/size_f.h
@@ -19,6 +19,14 @@ class UI_EXPORT SizeF : public SizeBase<SizeF, float> {
   SizeF(float width, float height);
   ~SizeF();
 
+  SizeF Scale(float scale) const WARN_UNUSED_RESULT {
+    return Scale(scale, scale);
+  }
+
+  SizeF Scale(float x_scale, float y_scale) const WARN_UNUSED_RESULT {
+    return SizeF(width() * x_scale, height() * y_scale);
+  }
+
   std::string ToString() const;
 };