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This generates localized strings.xml files (e.g.
values-fr/strings.xml) from grd and xtb files at build time. This
means we no longer need to check in localized strings.xml files. Note:
the xtb files are empty until translations are available.

Benefits:
 - 41 fewer extraneous results when grepping Java string IDs
 - Switching from maintaining strings in strings.xml over to using a
   grd file is One Trivial CL* away: just include English in the list
   of languages for which we generate strings.xml files.

*Restrictions may apply

BUG=167248

Review URL: https://codereview.chromium.org/11659006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@176134 0039d316-1c4b-4281-b951-d872f2087c98