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Requiring developers to update their extensions to manifest_version 2 when
loading them as unpacked extensions was more disruptive than we anticipated.
We want to make sure our documentation is in better shape and that folks have a
chance to move to manifest_version 2 on their own schedule before flipping this
switch.

Review URL: http://codereview.chromium.org/8907056

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@114556 0039d316-1c4b-4281-b951-d872f2087c98