[Intl] Remove dead code from runtime/runtime-intl.cc

Cleanup runtime/runtime-intl.cc by removing dead code, namely
Runtime_CanonicalizeLanguageTag and Runtime_GetDefaultICULocale.

Bug: v8:8439,v8:5751
Change-Id: Id8712b2f3b2ddffc0e289b904f17ae3b09faffae
Reviewed-on: https://chromium-review.googlesource.com/c/1329705
Commit-Queue: Sathya Gunasekaran <gsathya@chromium.org>
Reviewed-by: Sathya Gunasekaran <gsathya@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57980}

src/runtime/runtime-intl.cc

@@ -52,20 +52,6 @@ RUNTIME_FUNCTION(Runtime_FormatListToParts) {
       isolate, JSListFormat::FormatListToParts(isolate, list_format, list));
 }
 
-// ECMA 402 6.2.3
-RUNTIME_FUNCTION(Runtime_CanonicalizeLanguageTag) {
-  HandleScope scope(isolate);
-
-  DCHECK_EQ(1, args.length());
-  CONVERT_ARG_HANDLE_CHECKED(Object, locale, 0);
-
-  std::string canonicalized;
-  if (!Intl::CanonicalizeLanguageTag(isolate, locale).To(&canonicalized)) {
-    return ReadOnlyRoots(isolate).exception();
-  }
-  return *isolate->factory()->NewStringFromAsciiChecked(canonicalized.c_str());
-}
-
 RUNTIME_FUNCTION(Runtime_GetDefaultICULocale) {
   HandleScope scope(isolate);
 

src/runtime/runtime.h

@@ -198,7 +198,6 @@ namespace internal {
 
 #ifdef V8_INTL_SUPPORT
 #define FOR_EACH_INTRINSIC_INTL(F, I) \
-  F(CanonicalizeLanguageTag, 1, 1)    \
   F(FormatList, 2, 1)                 \
   F(FormatListToParts, 2, 1)          \
   F(GetDefaultICULocale, 0, 1)        \