Revert of [regexp] implement character classes for unicode regexps.

src/ostreams.cc

Index: src/ostreams.cc
diff --git a/src/ostreams.cc b/src/ostreams.cc
index 120db257cd19e27fe91068c4dab99dfba709e9f7..a7a67f5d2f06002fc9899b7c391476fd16022932 100644
--- a/src/ostreams.cc
+++ b/src/ostreams.cc
@@ -3,7 +3,6 @@
 // found in the LICENSE file.
 
 #include "src/ostreams.h"
-#include "src/objects.h"
 
 #if V8_OS_WIN
 #if _MSC_VER < 1900
@@ -61,16 +60,6 @@
   return os << buf;
 }
 
-
-std::ostream& PrintUC32(std::ostream& os, int32_t c, bool (*pred)(uint16_t)) {
-  if (c <= String::kMaxUtf16CodeUnit) {
-    return PrintUC16(os, static_cast<uint16_t>(c), pred);
-  }
-  char buf[13];
-  snprintf(buf, sizeof(buf), "\\u{%06x}", c);
-  return os << buf;
-}
-
 }  // namespace
 
 
@@ -92,10 +81,5 @@
   return PrintUC16(os, c.value, IsPrint);
 }
 
-
-std::ostream& operator<<(std::ostream& os, const AsUC32& c) {
-  return PrintUC32(os, c.value, IsPrint);
-}
-
 }  // namespace internal
 }  // namespace v8