Separate out some more ICU from base and into base/i18n....

chrome/browser/net/url_fixer_upper.cc

Index: chrome/browser/net/url_fixer_upper.cc
===================================================================
--- chrome/browser/net/url_fixer_upper.cc	(revision 28217)
+++ chrome/browser/net/url_fixer_upper.cc	(working copy)
@@ -70,6 +70,20 @@
       UTF8ComponentToWideComponent(text_utf8, parts_utf8.ref);
 }
 
+TrimPositions TrimWhitespaceUTF8(const std::string& input,
+                                 TrimPositions positions,
+                                 std::string* output) {
+  // This implementation is not so fast since it converts the text encoding
+  // twice. Please feel free to file a bug if this function hurts the
+  // performance of Chrome.
+  DCHECK(IsStringUTF8(input));
+  std::wstring input_wide = UTF8ToWide(input);
+  std::wstring output_wide;
+  TrimPositions result = TrimWhitespace(input_wide, positions, &output_wide);
+  *output = WideToUTF8(output_wide);
+  return result;
+}
+
 }  // namespace
 
 // does some basic fixes for input that we want to test for file-ness