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A previous CL left AcceleratorControllerDelegateMash empty. Most of the
commands in AcceleratorControllerDelegateClassic work fine under mash,
so put all the commands back in AcceleratorController. Add early exits
for the few that don't work under mash.

These files were split up during the WmWindow conversion, when some ash
subdirectories were not allowed to use aura.

Bug: 612331
Test: ash_unittests, chrome browser_tests
Change-Id: Ic4ce3783c1c50ef85091bd012c7b366b26761120
Reviewed-on: https://chromium-review.googlesource.com/803054
Commit-Queue: James Cook <jamescook@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521140}