add CollapseWhitespaceASCII

base/string_util.h

Index: base/string_util.h
diff --git a/base/string_util.h b/base/string_util.h
index b082078117ee126ae1a20d4231b74d933426bbc5..44b6d031ca98b6bbdfe88b2951242a0ae65c70d0 100644
--- a/base/string_util.h
+++ b/base/string_util.h
@@ -171,6 +171,8 @@ TrimPositions TrimWhitespace(const std::string& input,
 // (3) All other whitespace sequences are converted to single spaces.
 std::wstring CollapseWhitespace(const std::wstring& text,
                                 bool trim_sequences_with_line_breaks);
+std::string CollapseWhitespaceASCII(const std::string& text,
+                                    bool trim_sequences_with_line_breaks);
 
 // These convert between ASCII (7-bit) and Wide/UTF16 strings.
 std::string WideToASCII(const std::wstring& wide);