Fix for errors wrt exceptions in the global scope. Fixes issue 1070
R=blickly
Fix DisambiguateProperties handling of quoted properties

Fixes issue 1024
-------------
Created by MOE: http://code.google.com/p/moe-java
MOE_MIGRATED_REVID=51382261
Added some chrome.sockets externs as defined in http://developer.chrome.com/apps/socket.html.
-------------
Created by MOE: http://code.google.com/p/moe-java
MOE_MIGRATED_REVID=51408701
Merge remote-tracking branch: upstream/master