Move ReadFileToString to the base namespace.

net/base/file_stream_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 "net/base/file_stream.h"
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/file_util.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 999 matching lines @@
   ASSERT_EQ(4, write_stream->Truncate(4));
 
   // Write again.
   write_stream->WriteSync(test_data, 4);
 
   // Close the stream.
   write_stream.reset();
 
   // Read in the contents and make sure we get back what we expected.
   std::string read_contents;
-  EXPECT_TRUE(file_util::ReadFileToString(temp_file_path(), &read_contents));
+  EXPECT_TRUE(base::ReadFileToString(temp_file_path(), &read_contents));
 
   EXPECT_EQ("01230123", read_contents);
 }
 
 TEST_F(FileStreamTest, AsyncOpenAndDelete) {
   scoped_ptr<FileStream> stream(new FileStream(NULL));
   int flags = base::PLATFORM_FILE_OPEN |
       base::PLATFORM_FILE_WRITE |
       base::PLATFORM_FILE_ASYNC;
   TestCompletionCallback open_callback;
@@ skipping 42 matching lines @@
   scoped_refptr<IOBuffer> buf = new WrappedIOBuffer(NULL);
   rv = stream->Read(buf.get(), 1, callback.callback());
   if (rv == ERR_IO_PENDING)
     rv = callback.WaitForResult();
   EXPECT_LT(rv, 0);
 }
 
 }  // namespace
 
 }  // namespace net