Revert "Fix inconsistencies wrt whitespaces."

src/runtime.cc

Index: src/runtime.cc
diff --git a/src/runtime.cc b/src/runtime.cc
index 05de32d60949a941b68c75a4044ed2a59858ab5a..3596add429ee9335994c525ad946be41648d6842 100644
--- a/src/runtime.cc
+++ b/src/runtime.cc
@@ -6105,10 +6105,8 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_StringToNumber) {
       // Fast check for a junk value. A valid string may start from a
       // whitespace, a sign ('+' or '-'), the decimal point, a decimal digit or
       // the 'I' character ('Infinity'). All of that have codes not greater than
-      // '9' except 'I', NBSP and NEL.
-      if (data[start_pos] != 'I' &&
-          data[start_pos] != 0xa0 &&
-          data[start_pos] != 0x85) {
+      // '9' except 'I' and  .
+      if (data[start_pos] != 'I' && data[start_pos] != 0xa0) {
         return isolate->heap()->nan_value();
       }
     } else if (len - start_pos < 10 && AreDigits(data, start_pos, len)) {
@@ -6543,6 +6541,11 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_StringToUpperCase) {
 }
 
 
+static inline bool IsTrimWhiteSpace(unibrow::uchar c) {
+  return unibrow::WhiteSpace::Is(c) || c == 0x200b || c == 0xfeff;
+}
+
+
 RUNTIME_FUNCTION(MaybeObject*, Runtime_StringTrim) {
   HandleScope scope(isolate);
   ASSERT(args.length() == 3);
@@ -6555,17 +6558,15 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_StringTrim) {
   int length = string->length();
 
   int left = 0;
-  UnicodeCache* unicode_cache = isolate->unicode_cache();
   if (trimLeft) {
-    while (left < length && unicode_cache->IsWhiteSpace(string->Get(left))) {
+    while (left < length && IsTrimWhiteSpace(string->Get(left))) {
       left++;
     }
   }
 
   int right = length;
   if (trimRight) {
-    while (right > left &&
-           unicode_cache->IsWhiteSpace(string->Get(right - 1))) {
+    while (right > left && IsTrimWhiteSpace(string->Get(right - 1))) {
       right--;
     }
   }