gfx: Remove implicit conversions from gfx::Rect to gfx::RectF.

ui/gfx/geometry/rect.h

Index: ui/gfx/geometry/rect.h
diff --git a/ui/gfx/geometry/rect.h b/ui/gfx/geometry/rect.h
index 4ce85a0cfef9a25bbba39d9cb840d076a5f2eab4..9e0508d59eb8b6f009a8b35378df8a7df9b7149a 100644
--- a/ui/gfx/geometry/rect.h
+++ b/ui/gfx/geometry/rect.h
@@ -18,7 +18,6 @@
 
 #include "base/numerics/safe_conversions.h"
 #include "ui/gfx/geometry/point.h"
-#include "ui/gfx/geometry/rect_f.h"
 #include "ui/gfx/geometry/size.h"
 #include "ui/gfx/geometry/vector2d.h"
 
@@ -57,11 +56,6 @@ class GFX_EXPORT Rect {
   CGRect ToCGRect() const;
 #endif
 
-  operator RectF() const {
-    return RectF(static_cast<float>(x()), static_cast<float>(y()),
-                 static_cast<float>(width()), static_cast<float>(height()));
-  }
-
   int x() const { return origin_.x(); }
   void set_x(int x) { origin_.set_x(x); }