Minor sky/engine updates for Mac target

sky/engine/core/editing/EditingBehavior.cpp

Index: sky/engine/core/editing/EditingBehavior.cpp
diff --git a/sky/engine/core/editing/EditingBehavior.cpp b/sky/engine/core/editing/EditingBehavior.cpp
index 410e06e184978c158720539235e22b618ceea55d..e42b804b0ae9379f1cdcb41b5e571cdbac993853 100644
--- a/sky/engine/core/editing/EditingBehavior.cpp
+++ b/sky/engine/core/editing/EditingBehavior.cpp
@@ -40,18 +40,6 @@ static const unsigned CtrlKey = 1 << 0;
 static const unsigned AltKey = 1 << 1;
 static const unsigned ShiftKey = 1 << 2;
 static const unsigned MetaKey = 1 << 3;
-#if OS(MACOSX) && !OS(IOS)
-// Aliases for the generic key defintions to make kbd shortcuts definitions more
-// readable on OS X.
-static const unsigned OptionKey  = AltKey;
-
-// Do not use this constant for anything but cursor movement commands. Keys
-// with cmd set have their |isSystemKey| bit set, so chances are the shortcut
-// will not be executed. Another, less important, reason is that shortcuts
-// defined in the renderer do not blink the menu item that they triggered. See
-// http://crbug.com/25856 and the bugs linked from there for details.
-static const unsigned CommandKey = MetaKey;
-#endif
 
 // Keys with special meaning. These will be delegated to the editor using
 // the execCommand() method