Move ReadFileToString to the base namespace.

chrome/browser/google_apis/drive_api_requests_unittest.cc

 // Copyright (c) 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 "base/bind.h"
 #include "base/file_util.h"
 #include "base/files/file_path.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
@@ skipping 169 matching lines @@
       return scoped_ptr<net::test_server::HttpResponse>();
     }
 
     http_request_ = request;
 
     scoped_ptr<net::test_server::BasicHttpResponse> response(
         new net::test_server::BasicHttpResponse);
     response->set_code(net::HTTP_PRECONDITION_FAILED);
 
     std::string content;
-    if (file_util::ReadFileToString(expected_precondition_failed_file_path_,
-                                    &content)) {
+    if (base::ReadFileToString(expected_precondition_failed_file_path_,
+                               &content)) {
       response->set_content(content);
       response->set_content_type("application/json");
     }
 
     return response.PassAs<net::test_server::HttpResponse>();
   }
 
   // Returns the response based on set expected upload url.
   // The response contains the url in its "Location: " header. Also, it doesn't
   // have any content.
@@ skipping 1379 matching lines @@
         test_util::CreateQuitCallback(
             &run_loop,
             test_util::CreateCopyResultCallback(&result_code, &temp_file)),
         GetContentCallback(),
         ProgressCallback());
     request_sender_->StartRequestWithRetry(request);
     run_loop.Run();
   }
 
   std::string contents;
-  file_util::ReadFileToString(temp_file, &contents);
+  base::ReadFileToString(temp_file, &contents);
   base::DeleteFile(temp_file, false);
 
   EXPECT_EQ(HTTP_SUCCESS, result_code);
   EXPECT_EQ(net::test_server::METHOD_GET, http_request_.method);
   EXPECT_EQ(kTestDownloadPathPrefix + kTestId, http_request_.relative_url);
   EXPECT_EQ(kDownloadedFilePath, temp_file);
 
   const std::string expected_contents = kTestId + kTestId + kTestId;
   EXPECT_EQ(expected_contents, contents);
 }
 
 }  // namespace google_apis