Revert 277797 "Refactor tool-bar event handlers."

Revert 277797 "Refactor tool-bar event handlers."

> Refactor tool-bar event handlers.
> 
> The tool-bar is being phased out as part of the apps v2 work, but as
> part of the transition, the functionality it provides needs to be shared
> between it and the window frame. Step one is to disentangle some of the
> event handling code from client_session.js and toolbar.js.
> 
> NOTRY=true
> 
> Review URL: https://codereview.chromium.org/336293003

TBR=jamiewalch@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=277838

[macourteau, 2014-06-17 19:59:32]

Committed patchset #1 manually as r277838 (tree was closed).