This change enables Chrome to load locale information for the extension. It detects default locale, and filters out all locales not supported
by Chrome or with invalid names/missing messages.
It also checks for folders that start with _ and are not in the reserved list.
We don't validate messages file with this CL.
Added support for loading supplied locale information to the extension_file_util, and detecting default locale.
Added new constants to extension class (_locales directory name, messages filename).
Added new error messages to _constants.
Added new unittests.
BUG=12131
TEST=There should be no visible changes, except in case of error when loading extension (e.g. create empty _locales folder and try loading).
Review URL: http://codereview.chromium.org/170015
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@23739 0039d316-1c4b-4281-b951-d872f2087c98
12 files changed
