Prepare ui/ module for compilation with OS X 10.7 deployment target.

ui/views/cocoa/widget_owner_nswindow_adapter.mm

Index: ui/views/cocoa/widget_owner_nswindow_adapter.mm
diff --git a/ui/views/cocoa/widget_owner_nswindow_adapter.mm b/ui/views/cocoa/widget_owner_nswindow_adapter.mm
index 0fbe5d545c29c9ea7262a4c7e46fa61f04d06c56..82909a4135bc278e7dbfd9743fe9a3c326e128f5 100644
--- a/ui/views/cocoa/widget_owner_nswindow_adapter.mm
+++ b/ui/views/cocoa/widget_owner_nswindow_adapter.mm
@@ -7,6 +7,7 @@
 #import <Cocoa/Cocoa.h>
 
 #include "base/logging.h"
+#include "ui/base/cocoa/cocoa_base_utils.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/geometry/vector2d.h"
 #import "ui/gfx/mac/coordinate_conversion.h"
@@ -74,11 +75,10 @@ gfx::Vector2d WidgetOwnerNSWindowAdapter::GetChildWindowOffset() const {
       [anchor_view_ convertRect:[anchor_view_ bounds] toView:nil];
   // Ensure we anchor off the top-left of |anchor_view_| (rect_in_window.origin
   // is the bottom-left of the view).
-  // TODO(tapted): Use -[NSWindow convertRectToScreen:] when we ditch 10.6.
   NSRect rect_in_screen = NSZeroRect;
-  rect_in_screen.origin =
-      [anchor_window_ convertBaseToScreen:NSMakePoint(NSMinX(rect_in_window),
-                                                      NSMaxY(rect_in_window))];
+  rect_in_screen.origin = ui::ConvertPointFromWindowToScreen(
+      anchor_window_,
+      NSMakePoint(NSMinX(rect_in_window), NSMaxY(rect_in_window)));

[Avi (use Gerrit), 2016/03/08 20:07:54]

Can we rewrite this so we do:

NSRect rect_in_window = ...
NSRect rect_in_screen = [anchor_window_ convertRectToScreen:rect_in_window];

and _then_ fiddle with the origin? If it's not too much work, that would be
cleaner.

[erikchen, 2016/03/08 20:57:41]

Done.

   return gfx::ScreenRectFromNSRect(rect_in_screen).OffsetFromOrigin();
 }