mac: Allow WebContents key handling to supplant extension overrides of the bookmark shortcut.

chrome/test/data/extensions/test_file_with_ctrl-d_keybinding.html

Index: chrome/test/data/extensions/test_file_with_ctrl-d_keybinding.html
diff --git a/chrome/test/data/extensions/test_file_with_ctrl-d_keybinding.html b/chrome/test/data/extensions/test_file_with_ctrl-d_keybinding.html
index f946bf0e27b62c0a2f62c523062b65c6f474850a..a032c6889bda58cd4cdf71430e35db4bc0793c15 100644
--- a/chrome/test/data/extensions/test_file_with_ctrl-d_keybinding.html
+++ b/chrome/test/data/extensions/test_file_with_ctrl-d_keybinding.html
@@ -2,13 +2,15 @@
   <script type="text/javascript">
 var ctrlDown = false;
 document.onkeyup = function(e) {
-  if (e.keyCode == 17)
+  // Ctrl is 17, left Command is 91, right Command is 93
+  if (e.keyCode == 17 || e.keyCode == 91 || e.keyCode == 93)
     ctrlDown = false;
 }
 document.onkeydown = function(e) {
-  if (e.keyCode == 17)
+  // Ctrl is 17, left Command is 91, right Command is 93
+  if (e.keyCode == 17 || e.keyCode == 91 || e.keyCode == 93) {
     ctrlDown = true;
-  else if (String.fromCharCode(e.keyCode) == 'D' && ctrlDown) {
+  } else if (String.fromCharCode(e.keyCode) == 'D' && ctrlDown) {
     document.body.bgColor = "magenta";
     return false;
   }