Bug 1349855 - Remove unused nsILocale. r=emk

After landing bug 1301640, 1st parameter of nsIScriptableDateFormat.FormatDateTime() is ignored now.  So it is unnecessary to create nsILocaleService from locale parameter.

MozReview-Commit-ID: GlqC0D9shdy

intl/locale/nsIScriptableDateFormat.idl

@@ -132,8 +132,7 @@ interface nsIScriptableDateFormat : nsISupports
      * you depend on any specific format or language.
      *
      * @param locale
-     *        Locale code of locale used to format the date or an empty string
+              Ignored. If you want to use specific locale, use Intl API instead.
-     *        to follow user preference.
      * @param dateFormatSelector
      *        Indicate which format should preferably be used for the date.
      *        Use one of the dateFormat* constants.

intl/locale/nsScriptableDateFormat.cpp

@@ -5,14 +5,13 @@
 
 #include "DateTimeFormat.h"
 #include "mozilla/Sprintf.h"
-#include "nsILocaleService.h"
 #include "nsIScriptableDateFormat.h"
 #include "nsCOMPtr.h"
 #include "nsServiceManagerUtils.h"
 
 static NS_DEFINE_CID(kLocaleServiceCID, NS_LOCALESERVICE_CID);
 
-class nsScriptableDateFormat : public nsIScriptableDateFormat {
+class nsScriptableDateFormat final : public nsIScriptableDateFormat {
  public: 
   NS_DECL_ISUPPORTS 
 
@@ -73,20 +72,8 @@ NS_IMETHODIMP nsScriptableDateFormat::FormatDateTime(
     return NS_ERROR_INVALID_ARG;
 
   nsresult rv;
-  nsAutoString localeName(aLocale);
   *dateTimeString = nullptr;
 
-  nsCOMPtr<nsILocale> locale;
-  // re-initialise locale pointer only if the locale was given explicitly
-  if (!localeName.IsEmpty()) {
-    // get locale service
-    nsCOMPtr<nsILocaleService> localeService(do_GetService(kLocaleServiceCID, &rv));
-    NS_ENSURE_SUCCESS(rv, rv);
-    // get locale
-    rv = localeService->NewLocale(localeName, getter_AddRefs(locale));
-    NS_ENSURE_SUCCESS(rv, rv);
-  }
-
   tm tmTime;
   time_t timetTime;