Move StringPiece into the base namespace. It is colliding

base/string_util_icu.cc

 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/string_util.h"
 
 #include <string.h>
 #include <vector>
 
 #include "base/basictypes.h"
@@ skipping 315 matching lines @@
 bool WideToUTF8(const wchar_t* src, size_t src_len, std::string* output) {
   if (src_len == 0) {
     output->clear();
     return true;
   }
 
   ReserveUTF8Output(src, src_len, output);
   return ConvertUnicode<wchar_t, std::string>(src, src_len, output);
 }
 
-std::wstring UTF8ToWide(const StringPiece& utf8) {
+std::wstring UTF8ToWide(const base::StringPiece& utf8) {
   std::wstring ret;
   if (utf8.empty())
     return ret;
 
   UTF8ToWide(utf8.data(), utf8.length(), &ret);
   return ret;
 }
 
 bool UTF8ToWide(const char* src, size_t src_len, std::wstring* output) {
   if (src_len == 0) {
@@ skipping 337 matching lines @@
   // 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;
 }