gfx: Make conversions from gfx::Point to PointF explicit.

ui/gfx/geometry/point.h

Index: ui/gfx/geometry/point.h
diff --git a/ui/gfx/geometry/point.h b/ui/gfx/geometry/point.h
index 1dcf1d62c7af0424a690ce4224e747457336a7f3..d3be2ac8b0851bcedd712ab61d631a8b911edb1c 100644
--- a/ui/gfx/geometry/point.h
+++ b/ui/gfx/geometry/point.h
@@ -8,7 +8,6 @@
 #include <iosfwd>
 #include <string>
 
-#include "ui/gfx/geometry/point_f.h"
 #include "ui/gfx/geometry/vector2d.h"
 #include "ui/gfx/gfx_export.h"
 
@@ -87,10 +86,6 @@ class GFX_EXPORT Point {
     return (y_ == rhs.y_) ? (x_ < rhs.x_) : (y_ < rhs.y_);
   }
 
-  operator PointF() const {
-    return PointF(static_cast<float>(x()), static_cast<float>(y()));
-  }
-
   // Returns a string representation of point.
   std::string ToString() const;