gfx: Make conversions from Size to SizeF be explicit.

cc/test/layer_test_common.cc

Index: cc/test/layer_test_common.cc
diff --git a/cc/test/layer_test_common.cc b/cc/test/layer_test_common.cc
index 7cb97cd51bc41e78f0d754886d67204728239cca..63eb3eaa277ac13136397ee3e602aebc46f86c0d 100644
--- a/cc/test/layer_test_common.cc
+++ b/cc/test/layer_test_common.cc
@@ -29,11 +29,9 @@ static bool CanRectFBeSafelyRoundedToRect(const gfx::RectF& r) {
     return false;
 
   // Ensure that the values are actually integers.
-  if (gfx::ToFlooredPoint(r.origin()) == r.origin() &&
-      gfx::ToFlooredSize(r.size()) == r.size())
-    return true;
-
-  return false;
+  gfx::RectF floored_rect(std::floor(r.x()), std::floor(r.y()),
+                          std::floor(r.width()), std::floor(r.height()));
+  return floored_rect == r;
 }
 
 void LayerTestCommon::VerifyQuadsExactlyCoverRect(const QuadList& quads,