ash: Add ctrl+search accelerator key to toggle app list.
ash: Add ctrl+search accelerator key to toggle app list.

BUG=116944
TEST=Verify ctrl+search toggle app list.


Review URL: http://codereview.chromium.org/9623019

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@125561 0039d316-1c4b-4281-b951-d872f2087c98

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