Bug 862401: make sure nsDefaultURIFixup::KeywordToURI propagates POST data. sr=bz, r=gavin

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rename : browser/base/content/test/browser_keywordSearch.js => browser/base/content/test/browser_keywordSearch_postData.js
rename : content/base/test/bug435425.sjs => browser/base/content/test/print_postdata.sjs