Do not convert from RectF to Rect by flooring.

ui/gfx/rect_f.cc

Index: ui/gfx/rect_f.cc
diff --git a/ui/gfx/rect_f.cc b/ui/gfx/rect_f.cc
index 6677c29e459df79ef09c51e1faba82fdc54ab1bf..c515731b5813c14f581518f2470a6ab6c3b5f711 100644
--- a/ui/gfx/rect_f.cc
+++ b/ui/gfx/rect_f.cc
@@ -8,6 +8,7 @@
 #include "base/stringprintf.h"
 #include "ui/gfx/insets_f.h"
 #include "ui/gfx/rect_base_impl.h"
+#include "ui/gfx/safe_floor_ceil.h"
 
 namespace gfx {
 
@@ -36,10 +37,6 @@ RectF::RectF(const gfx::PointF& origin, const gfx::SizeF& size)
 
 RectF::~RectF() {}
 
-Rect RectF::ToRect() const {
-  return Rect(origin().ToPoint(), size().ToSize());
-}
-
 std::string RectF::ToString() const {
   return base::StringPrintf("%s %s",
                             origin().ToString().c_str(),