Revert of [date] Add ICU backend for timezone info behind a flag

src/i18n.cc

Index: src/i18n.cc
diff --git a/src/i18n.cc b/src/i18n.cc
index a6e201b935fc2663ab91aa2d77d48b8014a77b35..81a8663d149a3ab57201109394c481e66f52516f 100644
--- a/src/i18n.cc
+++ b/src/i18n.cc
@@ -13,7 +13,6 @@
 #include "src/objects-inl.h"
 #include "src/string-case.h"
 #include "unicode/brkiter.h"
-#include "unicode/bytestream.h"
 #include "unicode/calendar.h"
 #include "unicode/coll.h"
 #include "unicode/curramt.h"
@@ -1213,57 +1212,5 @@
   return is_upper ? ConvertToUpper(s, isolate) : ConvertToLower(s, isolate);
 }
 
-ICUTimezoneCache::ICUTimezoneCache() : timezone_(nullptr) { Clear(); }
-
-ICUTimezoneCache::~ICUTimezoneCache() { Clear(); }
-
-const char* ICUTimezoneCache::LocalTimezone(double time_ms) {
-  bool is_dst = DaylightSavingsOffset(time_ms) != 0;
-  char* name = is_dst ? dst_timezone_name_ : timezone_name_;
-  if (name[0] == '\0') {
-    icu::UnicodeString result;
-    GetTimeZone()->getDisplayName(is_dst, icu::TimeZone::LONG, result);
-    result += '\0';
-
-    icu::CheckedArrayByteSink byte_sink(name, kMaxTimezoneChars);
-    result.toUTF8(byte_sink);
-    CHECK(!byte_sink.Overflowed());
-  }
-  return const_cast<const char*>(name);
-}
-
-icu::TimeZone* ICUTimezoneCache::GetTimeZone() {
-  if (timezone_ == nullptr) {
-    timezone_ = icu::TimeZone::createDefault();
-  }
-  return timezone_;
-}
-
-bool ICUTimezoneCache::GetOffsets(double time_ms, int32_t* raw_offset,
-                                  int32_t* dst_offset) {
-  UErrorCode status = U_ZERO_ERROR;
-  GetTimeZone()->getOffset(time_ms, false, *raw_offset, *dst_offset, status);
-  return U_SUCCESS(status);
-}
-
-double ICUTimezoneCache::DaylightSavingsOffset(double time_ms) {
-  int32_t raw_offset, dst_offset;
-  if (!GetOffsets(time_ms, &raw_offset, &dst_offset)) return 0;
-  return dst_offset;
-}
-
-double ICUTimezoneCache::LocalTimeOffset() {
-  int32_t raw_offset, dst_offset;
-  if (!GetOffsets(icu::Calendar::getNow(), &raw_offset, &dst_offset)) return 0;
-  return raw_offset;
-}
-
-void ICUTimezoneCache::Clear() {
-  delete timezone_;
-  timezone_ = nullptr;
-  timezone_name_[0] = '\0';
-  dst_timezone_name_[0] = '\0';
-}
-
 }  // namespace internal
 }  // namespace v8