Make all GRIT placeholders only use caps and underscores.
Make all GRIT placeholders only use caps and underscores.

The translation console only knows how to handle CAPS and
underscores for placeholders.  There's a check in the GRIT
code that verifies this when we generate the translation
console upload format.  But we never go through this code
path when generating the .rc and .h files.
Review URL: http://codereview.chromium.org/14071

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@6934 0039d316-1c4b-4281-b951-d872f2087c98

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