Make base::IsUnicodeWhitespace('\0') return false.

base/strings/string_util.h

Index: base/strings/string_util.h
diff --git a/base/strings/string_util.h b/base/strings/string_util.h
index 169726bca5a128e05c2585d6947003e7f792a5be..2578569ce014a4b5b9da1f6bea9e419046b0652c 100644
--- a/base/strings/string_util.h
+++ b/base/strings/string_util.h
@@ -358,9 +358,7 @@ inline bool IsHexDigit(Char c) {
 BASE_EXPORT char HexDigitToInt(wchar_t c);
 
 // Returns true if it's a Unicode whitespace character.
-inline bool IsUnicodeWhitespace(wchar_t c) {
-  return wcschr(base::kWhitespaceWide, c) != NULL;
-}
+BASE_EXPORT bool IsUnicodeWhitespace(wchar_t c);
 
 // Return a byte string in human-readable format with a unit suffix. Not
 // appropriate for use in any UI; use of FormatBytes and friends in ui/base is