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The API proposal doc is 
http://sites.google.com/a/chromium.org/dev/developers/design-documents/extensions/i18n-api

This CL only adds the getter of accept languages: 
chrome.i18n.getAcceptLanguages().

The setter of accept languages will be added in a separate CL.

BUG=http://crbug.com/14574
TEST=TEST=There is an extension in chrome\test\data\extensions\samples\i18n.
Load this extension. It creates a toolstrip button.  Click this button, you
should get chrome's accept languages.
Review URL: http://codereview.chromium.org/174116

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@25810 0039d316-1c4b-4281-b951-d872f2087c98