Move ElideString() from base/string_util.cc to app/text_elider.cc to ...

base/string_util.h

Index: base/string_util.h
===================================================================
--- base/string_util.h	(revision 69274)
+++ base/string_util.h	(working copy)
@@ -523,14 +523,6 @@
                                    const string16& a,
                                    size_t* offset);
 
-// If the size of |input| is more than |max_len|, this function returns true and
-// |input| is shortened into |output| by removing chars in the middle (they are
-// replaced with up to 3 dots, as size permits).
-// Ex: ElideString(L"Hello", 10, &str) puts Hello in str and returns false.
-// ElideString(L"Hello my name is Tom", 10, &str) puts "Hell...Tom" in str and
-// returns true.
-bool ElideString(const std::wstring& input, int max_len, std::wstring* output);
-
 // Returns true if the string passed in matches the pattern. The pattern
 // string can contain wildcards like * and ?
 // The backslash character (\) is an escape character for * and ?