Use base namespace for string16 in components and cloud_print.

cloud_print/common/win/cloud_print_utils.cc

 // Copyright 2013 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 "cloud_print/common/win/cloud_print_utils.h"
 
 #include <windows.h>
 
 #include "base/win/registry.h"
 
 namespace cloud_print {
 
 namespace {
 
 // Google Update related constants.
 const wchar_t kClientStateKey[] = L"SOFTWARE\\Google\\Update\\ClientState\\";
 const wchar_t* kUsageKey = L"dr";
 
 }  // namespace
 
 HRESULT GetLastHResult() {
   DWORD error_code = GetLastError();
   return error_code ? HRESULT_FROM_WIN32(error_code) : E_FAIL;
 }
 
-string16 LoadLocalString(DWORD id) {
+base::string16 LoadLocalString(DWORD id) {
   static wchar_t dummy = L'\0';
   HMODULE module = NULL;
   ::GetModuleHandleEx(GET_MODULE_HANDLE_EX_FLAG_UNCHANGED_REFCOUNT |
                       GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS, &dummy, &module);
   LPCWSTR buffer = NULL;
   // If the last parameter is 0, LoadString assume that 3rd parameter type is
   // LPCWSTR* and assign pointer to read-only memory with resource.
   int count = ::LoadString(module, id, reinterpret_cast<LPWSTR>(&buffer), 0);
   if (!buffer)
-    return string16();
-  return string16(buffer, buffer + count);
+    return base::string16();
+  return base::string16(buffer, buffer + count);
 }
 
-string16 GetErrorMessage(HRESULT hr) {
+base::string16 GetErrorMessage(HRESULT hr) {
   LPWSTR buffer = NULL;
   ::FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS |
                   FORMAT_MESSAGE_ALLOCATE_BUFFER,
                   0, hr, 0, reinterpret_cast<LPWSTR>(&buffer), 0, NULL);
-  string16 result(buffer);
+  base::string16 result(buffer);
   ::LocalFree(buffer);
   return result;
 }
 
-void SetGoogleUpdateUsage(const string16& product_id) {
+void SetGoogleUpdateUsage(const base::string16& product_id) {
   // Set appropriate key to 1 to let Omaha record usage.
   base::win::RegKey key;
   if (key.Create(HKEY_CURRENT_USER,
                  (kClientStateKey + product_id).c_str(),
                  KEY_SET_VALUE) != ERROR_SUCCESS ||
       key.WriteValue(kUsageKey, L"1") != ERROR_SUCCESS) {
     LOG(ERROR) << "Unable to set usage key";
   }
 }
 
 }  // namespace cloud_print