Move ReadFileToString to the base namespace.

chrome/browser/chromeos/extensions/file_manager/file_browser_handler_api_test.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.
 
 // File contains browser tests for the fileBrowserHandler api.
 
 #include "chrome/browser/chromeos/extensions/file_manager/file_browser_handler_api.h"
 
 #include <vector>
 
@@ skipping 41 matching lines @@
   bool success;
   // The path file selector should return back to the function.
   base::FilePath selected_path;
 };
 
 // Checks that file under path |selected_path| contains |expected_contents|.
 // Must be called on the file thread.
 void ExpectFileContentEquals(const base::FilePath& selected_path,
                              const std::string& expected_contents) {
   std::string test_file_contents;
-  ASSERT_TRUE(file_util::ReadFileToString(selected_path, &test_file_contents));
+  ASSERT_TRUE(base::ReadFileToString(selected_path, &test_file_contents));
   EXPECT_EQ(expected_contents, test_file_contents);
 }
 
 // Mocks FileSelector used by FileBrowserHandlerInternalSelectFileFunction.
 // When |SelectFile| is called, it will check that file name suggestion is as
 // expected, and respond to the extension function with specified selection
 // results.
 class MockFileSelector : public file_manager::FileSelector {
  public:
   MockFileSelector(const base::FilePath& suggested_name,
@@ skipping 293 matching lines @@
           select_file_function.get(),
           "[{\"suggestedName\": \"/path_to_file/some_file_name.txt\"}]",
           browser())));
 
   EXPECT_FALSE(utils::GetBoolean(result.get(), "success"));
   DictionaryValue* entry_info;
   EXPECT_FALSE(result->GetDictionary("entry", &entry_info));
 }
 
 }  // namespace