Move ReadFileToString to the base namespace.

content/browser/download/base_file_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 "content/browser/download/base_file.h"
 
 #include "base/file_util.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/logging.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 53 matching lines @@
     if (!expected_error_) {
       EXPECT_EQ(static_cast<int64>(expected_data_.size()),
                 base_file_->bytes_so_far());
     }
 
     base::FilePath full_path = base_file_->full_path();
 
     if (!expected_data_.empty() && !expected_error_) {
       // Make sure the data has been properly written to disk.
       std::string disk_data;
-      EXPECT_TRUE(file_util::ReadFileToString(full_path, &disk_data));
+      EXPECT_TRUE(base::ReadFileToString(full_path, &disk_data));
       EXPECT_EQ(expected_data_, disk_data);
     }
 
     // Make sure the mock BrowserThread outlives the BaseFile to satisfy
     // thread checks inside it.
     base_file_.reset();
 
     EXPECT_EQ(expect_file_survives_, base::PathExists(full_path));
   }
 
@@ skipping 540 matching lines @@
   base::FilePath temp_file;
   ASSERT_TRUE(file_util::CreateTemporaryFileInDir(temp_dir_.path(),
                                                   &temp_file));
   ASSERT_FALSE(temp_file.empty());
   EXPECT_STREQ(temp_file.DirName().value().c_str(),
                base_file_->full_path().DirName().value().c_str());
   base_file_->Finish();
 }
 
 }  // namespace content