Revert 110637 - Add ShellAcceleratorController that manages global keyboard accelerators.

Revert 110637 - Add ShellAcceleratorController that manages global keyboard accelerators.

- Create ShellAcceleratorController that manages global keyboard accelerators and also processes several accelerators as a target.
- Create ShellAcceleratorFilter, which is used by DesktopEventFilter to handle accelerators.
- Add a function to Shell for accessing ShellAcceleratorController.

BUG=97255
TEST=Manual


Review URL: http://codereview.chromium.org/8465021

TBR=mazda@chromium.org
Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=110643