Add patch for the accelerator.

1. Allow Ctrl+Alt accelerators on Windows.
2. Fix showing text for code key F2 to F22.
Add patch to disable sandbox in SharedWorker.
Add patch to fix the wrong hittest in child.
Add patch to suppress to spam loggings from mojo.

Imported from:
http://src.chromium.org/viewvc/chrome/trunk/src/mojo/system/channel.cc?revision=275141