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

content/renderer/render_widget.h

Index: content/renderer/render_widget.h
diff --git a/content/renderer/render_widget.h b/content/renderer/render_widget.h
index 82646cd80388353bff20b19c99e0db1756f124ab..7b6d2bf5e4057641ba0aa239a8e0d4cdfec32f03 100644
--- a/content/renderer/render_widget.h
+++ b/content/renderer/render_widget.h
@@ -779,8 +779,8 @@ class CONTENT_EXPORT RenderWidget
 
   // Popups may be displaced when screen metrics emulation is enabled.
   // These values are used to properly adjust popup position.
-  gfx::PointF popup_view_origin_for_emulation_;
-  gfx::PointF popup_screen_origin_for_emulation_;
+  gfx::Point popup_view_origin_for_emulation_;
+  gfx::Point popup_screen_origin_for_emulation_;
   float popup_origin_scale_for_emulation_;
 
   scoped_refptr<FrameSwapMessageQueue> frame_swap_message_queue_;