Move helper methods from i18n extension into runtime.

src/extensions/i18n/locale.h

-// Copyright 2013 the V8 project authors. All rights reserved.
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-// modification, are permitted provided that the following conditions are
-// met:
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-//       contributors may be used to endorse or promote products derived
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-// limitations under the License.
-
-#ifndef V8_EXTENSIONS_I18N_SRC_LOCALE_H_
-#define V8_EXTENSIONS_I18N_SRC_LOCALE_H_
-
-#include "unicode/uversion.h"
-#include "v8.h"
-
-namespace v8_i18n {
-
-// Canonicalizes the BCP47 language tag using BCP47 rules.
-// Returns 'invalid-tag' in case input was not well formed.
-void JSCanonicalizeLanguageTag(const v8::FunctionCallbackInfo<v8::Value>& args);
-
-// Returns a list of available locales for collator, date or number formatter.
-void JSAvailableLocalesOf(const v8::FunctionCallbackInfo<v8::Value>& args);
-
-// Returns default ICU locale.
-void JSGetDefaultICULocale(const v8::FunctionCallbackInfo<v8::Value>& args);
-
-// Returns an array of objects, that have maximized and base names of inputs.
-// Unicode extensions are dropped from both.
-// Input: ['zh-TW-u-nu-thai', 'sr']
-// Output: [{maximized: 'zh-Hant-TW', base: 'zh-TW'},
-//          {maximized: 'sr-Cyrl-RS', base: 'sr'}]
-void JSGetLanguageTagVariants(const v8::FunctionCallbackInfo<v8::Value>& args);
-
-}  // namespace v8_i18n
-
-#endif  // V8_EXTENSIONS_I18N_LOCALE_H_