bug 74244; Mac override of command-H (reserved by OSX) to command-shift-H for History (r=sdagley, sr=ben, a=asa, jaime)

suite/common/mac/platformCommunicatorOverlay.xul

@@ -10,6 +10,7 @@
   <menuitem id="menu_close" label="&closeCmd.label;" key="key_close" command="cmd_close"/>
   <key id="key_close"  key="&closeCmd.key;" command="cmd_close" modifiers="accel"/>
   <key id="key_closeWindow"  key="&closeCmd.key;" command="cmd_closeWindow" modifiers="accel,shift"/>
+  <key id="key_gotoHistory"  key="&historyCmd.key;" oncommand="toHistory();" modifiers="accel,shift"/>
 
   <menupopup id="menu_FilePopup">
     <!-- Page setup -->