Reword the management api permission warning text.
Reword the management api permission warning text.

The dialog has the prefix: "This extension can access:", so the current wording
was a little strange.

BUG=67859
TEST=Install an extension that uses the management permission.


Review URL: http://codereview.chromium.org/6065013

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@70472 0039d316-1c4b-4281-b951-d872f2087c98

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