Mac: Make cmd-shift-v an altenate shortcut for "paste and match style"
Mac: Make cmd-shift-v an altenate shortcut for "paste and match style"

nib changes: Duplicated the "paste and match style" menu and put it
below the existing item. Change the upper item's shortcut to
cmd-shift-v, marked the lower item to "alternate".

BUG=41472
TEST=Copy some html text, then go to a rich text editor, e.g. http://developer.yahoo.com/yui/examples/editor/simple_editor.html . Paste the text with cmd-v, it should look styled. Undo, paste with cmd-shift-v, it shouldn't. Undo, paste with cmd-shift-opt-v (the system default shortcut for this), it still shouldn't be styled. All three shortcuts should blink the "Edit" menu.

Review URL: http://codereview.chromium.org/6735045

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@80476 0039d316-1c4b-4281-b951-d872f2087c98

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