Move ReadFileToString to the base namespace.

chrome/browser/extensions/api/downloads/downloads_api_browsertest.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 "base/file_util.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/json/json_reader.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 2179 matching lines @@
                           "    \"current\": \"%s\"}}]",
                           result_id,
                           GetFilename("on_record.txt").c_str())));
   ASSERT_TRUE(WaitFor(api::OnChanged::kEventName,
       base::StringPrintf("[{\"id\": %d,"
                           "  \"state\": {"
                           "    \"previous\": \"in_progress\","
                           "    \"current\": \"complete\"}}]",
                           result_id)));
   std::string disk_data;
-  EXPECT_TRUE(file_util::ReadFileToString(item->GetTargetFilePath(),
-                                          &disk_data));
+  EXPECT_TRUE(base::ReadFileToString(item->GetTargetFilePath(), &disk_data));
   EXPECT_STREQ(kPayloadData, disk_data.c_str());
 }
 
 IN_PROC_BROWSER_TEST_F(DownloadExtensionTest,
                        DownloadExtensionTest_OnDeterminingFilename_NoChange) {
   GoOnTheRecord();
   LoadExtension("downloads_split");
   AddFilenameDeterminer();
   ASSERT_TRUE(StartEmbeddedTestServer());
   ASSERT_TRUE(test_server()->Start());
@@ skipping 1385 matching lines @@
       &conflict_action,
       &warnings);
   EXPECT_EQ("suggester", winner_id);
   EXPECT_EQ(FILE_PATH_LITERAL("b"), filename.value());
   EXPECT_EQ(api::FILENAME_CONFLICT_ACTION_PROMPT, conflict_action);
   EXPECT_FALSE(warnings.empty());
   EXPECT_EQ(extensions::ExtensionWarning::kDownloadFilenameConflict,
             warnings.begin()->warning_type());
   EXPECT_EQ("incumbent", warnings.begin()->extension_id());
 }