Treat keyCode 10 as "return" in JX.Event

Summary: Fixes T2753. Return is sent as either 10 or 13, depending on browser and OS. See, e.g. [[ http://code.google.com/p/chromium/issues/detail?id=79407 | this Chromium issue ]].

Test Plan: @cystorm confirmed this patch fixes the issue on his system.

Reviewers: btrahan, codeblock

Reviewed By: codeblock

CC: cystorm, aran

Maniphest Tasks: T2753

Differential Revision: https://secure.phabricator.com/D5381

externals/javelinjs/src/core/Event.js

@@ -229,6 +229,10 @@ JX.install('Event', {
     _keymap : {
       8     : 'delete',
       9     : 'tab',
+      // On Windows and Linux, Chrome sends '10' for return. On Mac OS X, it
+      // sends 13. Other browsers evidence varying degrees of diversity in their
+      // behavior. Treat '10' and '13' identically.
+      10    : 'return',
       13    : 'return',
       27    : 'esc',
       37    : 'left',