Delete some unused functions in core/platform/Language.*.

BUG=none
TEST=none; no behavior changes.

Review URL: https://chromiumcodereview.appspot.com/23479019

git-svn-id: svn://svn.chromium.org/blink/trunk@157112 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Move platform/chromium/LocalizedStringsChromium.cpp to platform/LocalizedStrings.cpp.

No need to use chromium directory and Chromium suffix.

BUG=none
TEST=none; no behavior changes.

Review URL: https://chromiumcodereview.appspot.com/23715005

git-svn-id: svn://svn.chromium.org/blink/trunk@157113 bbb929c8-8fbe-4397-9dbb-9b2b20218538