This is unacceptable so I downgrade it previous version of chrome (v.29) then anything back to normal. I don't know whether this only happen to me, or others may experience the same. But I've decided not to update chrome to version 30. These are my steps to block chrome from updating:
Disable Chrome update in Startup Program
You can do this by pressing the Start + R button to execute Run, then type "msconfig" (no quote) and press enter. See the start up tab and find list of program related to chrome update (usually GoogleUpdate), uncheck it and apply. For Windows 8 user, simply hit Esc + Shift + Ctrl (shortcut combination to execute Task Manager), click on start up tab » find google update » right click on it and choose disable.Disable Chrome Update from Schedule Task
For xp, vista, 7 user You can disable chrome auto update by pressing Start » All Programs » Control Panel » Performance and Maintenance » Scheduled Task » delete scheduled task file. Windows 8 user, press Start then type schedule » click setting from the right pane (the scheduled task will appears). See the "active task" tab then find list of task related to chrome update scheduler. Once you found it, right click and delete (must delete).Sometime chrome reschedule the task (rarely happened), this means You'll have to repeat the steps above. Or the final solution to prevent chrome from updating is to delete any file related to update process. You can find the file from your User profile » Local setting » application data » Google » Update. This is perfectly works for me, You can try it!