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

src/date.cc

Index: src/date.cc
diff --git a/src/date.cc b/src/date.cc
index 41ec17c25a0db2765c9d1333e7c3505ea0c8817f..6471bdb00af5074f20e71805cada1101b5b923b3 100644
--- a/src/date.cc
+++ b/src/date.cc
@@ -6,10 +6,6 @@
 
 #include "src/objects.h"
 #include "src/objects-inl.h"
-
-#ifdef V8_I18N_SUPPORT
-#include "src/i18n.h"
-#endif
 
 namespace v8 {
 namespace internal {
@@ -25,18 +21,6 @@
 static const char kDaysInMonths[] =
     {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
 
-DateCache::DateCache()
-    : stamp_(0),
-      tz_cache_(
-#ifdef V8_I18N_SUPPORT
-          FLAG_icu_timezone_data ? new ICUTimezoneCache()
-                                 : base::OS::CreateTimezoneCache()
-#else
-          base::OS::CreateTimezoneCache()
-#endif
-              ) {
-  ResetDateCache();
-}
 
 void DateCache::ResetDateCache() {
   static const int kMaxStamp = Smi::kMaxValue;