Revert "mac: Load the system hotkeys after launch."

Revert "mac: Load the system hotkeys after launch."
BUG=395187
TBR=erikchen@chromium.org

> mac: Load the system hotkeys after launch.
>
> Shortly after launch, the system hotkeys are loaded and parsed. If a hotkey is
> reserved by the system, it is not passed to the renderer. This allows system
> hotkeys like (cmd + `) to work even if a flash plugin is selected.
>
> Add a histogram to ensure that the system hotkey plist is being correctly
> loaded and parsed.
>
> BUG=383558
> TEST=Open 2 Chrome windows. Navigate one to www.twitch.tv. The site should
> include a flash plugin that automatically starts playing a video. Select the
> flash plugin. The hotkey combination (cmd + `) should switch between the open
> windows. The hotkey combination (cmd + L) should have no effect (it is a Chrome
> hotkey, not a browser hotkey).
>
> Review URL: https://codereview.chromium.org/370293004

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=284273

[ccameron, 2014-07-18 22:24:23]

The CQ bit was checked by ccameron@chromium.org

[commit-bot: I haz the power, 2014-07-18 22:28:58]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/ccameron@chromium.org/406693005/1

[commit-bot: I haz the power, 2014-07-19 01:44:25]

Change committed as 284273