Move ReadFileToString to the base namespace.

chrome/browser/history/expire_history_backend_unittest.cc

 // Copyright (c) 2012 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 <algorithm>
 #include <string>
 #include <utility>
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
@@ skipping 373 matching lines @@
   expired_favicons.clear();
   expirer_.DeleteFaviconsIfPossible(favicon_set, &expired_favicons);
   EXPECT_TRUE(HasFavicon(icon_id));
   EXPECT_TRUE(expired_favicons.empty());
 }
 
 // static
 bool ExpireHistoryTest::IsStringInFile(const base::FilePath& filename,
                                        const char* str) {
   std::string contents;
-  EXPECT_TRUE(file_util::ReadFileToString(filename, &contents));
+  EXPECT_TRUE(base::ReadFileToString(filename, &contents));
   return contents.find(str) != std::string::npos;
 }
 
 // Deletes a URL with a favicon that it is the last referencer of, so that it
 // should also get deleted.
 // Fails near end of month. http://crbug.com/43586
 TEST_F(ExpireHistoryTest, DISABLED_DeleteURLAndFavicon) {
   URLID url_ids[3];
   Time visit_times[4];
   AddExampleData(url_ids, visit_times);
@@ skipping 491 matching lines @@
   main_db_->GetVisitsForURL(url_id, &archived_visits);
   EXPECT_EQ(0U, archived_visits.size());
 }
 
 // TODO(brettw) add some visits with no URL to make sure everything is updated
 // properly. Have the visits also refer to nonexistent FTS rows.
 //
 // Maybe also refer to invalid favicons.
 
 }  // namespace history