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

src/i18n.h

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 // limitations under the License.
 
 #ifndef V8_I18N_H_
 #define V8_I18N_H_
 
-#include "src/base/timezone-cache.h"
 #include "src/objects.h"
 #include "unicode/uversion.h"
 
 namespace U_ICU_NAMESPACE {
 class BreakIterator;
 class Collator;
 class DecimalFormat;
 class SimpleDateFormat;
-class TimeZone;
 }
 
 namespace v8 {
 namespace internal {
 
 template <typename T>
 class Handle;
 
 class DateFormat {
  public:
@@ skipping 104 matching lines @@
 const UChar* GetUCharBufferFromFlat(const String::FlatContent& flat,
                                     std::unique_ptr<uc16[]>* dest,
                                     int32_t length);
 MUST_USE_RESULT Object* LocaleConvertCase(Handle<String> s, Isolate* isolate,
                                           bool is_to_upper, const char* lang);
 MUST_USE_RESULT Object* ConvertToLower(Handle<String> s, Isolate* isolate);
 MUST_USE_RESULT Object* ConvertToUpper(Handle<String> s, Isolate* isolate);
 MUST_USE_RESULT Object* ConvertCase(Handle<String> s, bool is_upper,
                                     Isolate* isolate);
 
-// ICUTimezoneCache calls out to ICU for TimezoneCache
-// functionality in a straightforward way.
-class ICUTimezoneCache : public base::TimezoneCache {
- public:
-  ICUTimezoneCache();
-
-  ~ICUTimezoneCache() override;
-
-  const char* LocalTimezone(double time_ms) override;
-
-  double DaylightSavingsOffset(double time_ms) override;
-
-  double LocalTimeOffset() override;
-
-  void Clear() override;
-
- private:
-  icu::TimeZone* GetTimeZone();
-
-  bool GetOffsets(double time_ms, int32_t* raw_offset, int32_t* dst_offset);
-
-  icu::TimeZone* timezone_;
-
-  static const int32_t kMaxTimezoneChars = 100;
-  char timezone_name_[kMaxTimezoneChars];
-  char dst_timezone_name_[kMaxTimezoneChars];
-};
-
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_I18N_H_