Move ReadFileToString to the base namespace.

ui/gfx/icon_util_unittest.cc

 // Copyright (c) 2011 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/file_util.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/path_service.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "third_party/skia/include/core/SkBitmap.h"
@@ skipping 74 matching lines @@
 
   // First, use the Windows API to load the icon, a basic validity test.
   HICON icon = LoadIconFromFile(icon_filename, kSmallIconWidth,
                                 kSmallIconHeight);
   EXPECT_NE(static_cast<HICON>(NULL), icon);
   if (icon != NULL)
     ::DestroyIcon(icon);
 
   // Read the file completely into memory.
   std::string icon_data;
-  ASSERT_TRUE(file_util::ReadFileToString(icon_filename, &icon_data));
+  ASSERT_TRUE(base::ReadFileToString(icon_filename, &icon_data));
   ASSERT_GE(icon_data.length(), sizeof(IconUtil::ICONDIR));
 
   // Ensure that it has exactly the expected number and sizes of icons, in the
   // expected order. This matches each entry of the loaded file's icon directory
   // with the corresponding element of kIconDimensions.
   // Also extracts the 256x256 entry as png_entry.
   const IconUtil::ICONDIR* icon_dir =
       reinterpret_cast<const IconUtil::ICONDIR*>(icon_data.data());
   EXPECT_EQ(expected_num_icons, icon_dir->idCount);
   ASSERT_GE(IconUtil::kNumIconDimensions, icon_dir->idCount);
@@ skipping 320 matching lines @@
 }
 
 // This tests that kNumIconDimensionsUpToMediumSize has the correct value.
 TEST_F(IconUtilTest, TestNumIconDimensionsUpToMediumSize) {
   ASSERT_LE(IconUtil::kNumIconDimensionsUpToMediumSize,
             IconUtil::kNumIconDimensions);
   EXPECT_EQ(IconUtil::kMediumIconSize,
             IconUtil::kIconDimensions[
                 IconUtil::kNumIconDimensionsUpToMediumSize - 1]);
 }