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

ui/base/cocoa/command_dispatcher.mm

Index: ui/base/cocoa/command_dispatcher.mm
diff --git a/ui/base/cocoa/command_dispatcher.mm b/ui/base/cocoa/command_dispatcher.mm
index 64ac8fd1bb229d5c448b7f73195ead700d89e2cd..46a351b4ce8c09b399011bf36313ac34db9fb6ec 100644
--- a/ui/base/cocoa/command_dispatcher.mm
+++ b/ui/base/cocoa/command_dispatcher.mm
@@ -5,6 +5,7 @@
 #import "ui/base/cocoa/command_dispatcher.h"
 
 #include "base/logging.h"
+#include "ui/base/cocoa/cocoa_base_utils.h"
 
 namespace {
 
@@ -15,8 +16,8 @@ NSEvent* KeyEventForWindow(NSWindow* window, NSEvent* event) {
   // Convert the event's location from the original window's coordinates into
   // our own.
   NSPoint location = [event locationInWindow];
-  location = [[event window] convertBaseToScreen:location];
-  location = [window convertScreenToBase:location];
+  location = ui::ConvertPointFromWindowToScreen([event window], location);
+  location = ui::ConvertPointFromScreenToWindow(window, location);
 
   // Various things *only* apply to key down/up.
   bool is_a_repeat = false;