[Autofill] (Mostly) fix Autofill popup positioning on multiple monitors.

chrome/browser/ui/cocoa/autofill/autofill_popup_view_bridge.mm

Index: chrome/browser/ui/cocoa/autofill/autofill_popup_view_bridge.mm
diff --git a/chrome/browser/ui/cocoa/autofill/autofill_popup_view_bridge.mm b/chrome/browser/ui/cocoa/autofill/autofill_popup_view_bridge.mm
index 18a41964d60739e434a33e324d34d5d91949c12a..cf1b5a72eeb704719c2f059680526acb04d20fdb 100644
--- a/chrome/browser/ui/cocoa/autofill/autofill_popup_view_bridge.mm
+++ b/chrome/browser/ui/cocoa/autofill/autofill_popup_view_bridge.mm
@@ -93,9 +93,7 @@ void AutofillPopupViewBridge::UpdateBoundsAndRedrawPopup() {
   NSRect frame = NSRectFromCGRect(controller_->popup_bounds().ToCGRect());
 
   // Flip coordinates back into Cocoa-land.

[Scott Hess - ex-Googler, 2013/06/27 21:55:58]

OK, per offline discussion, I think I see what you mean.  This comment maybe
could be expanded on the order of:
  // Flip from origin at top-left of screen 0 to origin at bottom-left of screen
0.
Mostly because it's not obvious from the local code.  It might also make sense
to phrase as:
  frame.origin.y = NSMaxY([screen frame]) - NSMaxY(frame);
to make it clear.

[Ilya Sherman, 2013/06/28 00:51:16]

Done.

-  // TODO(isherman): Does this agree with the controller's idea of handling
-  // multi-monitor setups correctly?
-  NSScreen* screen = [[controller_->container_view() window] screen];
+  NSScreen* screen = [[NSScreen screens] objectAtIndex:0];
   frame.origin.y = NSHeight([screen frame]) - NSMaxY(frame);
 
   // Leave room for the border.