Move ReadFileToString to the base namespace.

chrome/browser/icon_loader_linux.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 "chrome/browser/icon_loader.h"
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/file_util.h"
@@ skipping 32 matching lines @@
     default:
       NOTREACHED();
   }
 
   base::FilePath filename = base::nix::GetMimeIcon(group_, size_pixels);
   // We don't support SVG or XPM icons; this just spams the terminal so fail
   // quickly and don't try to read the file from disk first.
   if (filename.Extension() != ".svg" &&
       filename.Extension() != ".xpm") {
     string icon_data;
-    file_util::ReadFileToString(filename, &icon_data);
+    base::ReadFileToString(filename, &icon_data);
 
     SkBitmap bitmap;
     bool success = gfx::PNGCodec::Decode(
         reinterpret_cast<const unsigned char*>(icon_data.data()),
         icon_data.length(),
         &bitmap);
     if (success && !bitmap.empty()) {
       DCHECK_EQ(size_pixels, bitmap.width());
       DCHECK_EQ(size_pixels, bitmap.height());
       gfx::ImageSkia image_skia = gfx::ImageSkia::CreateFrom1xBitmap(bitmap);
       image_skia.MakeThreadSafe();
       image_.reset(new gfx::Image(image_skia));
     } else {
       LOG(WARNING) << "Unsupported file type or load error: "
                    << filename.value();
     }
   }
 
   target_message_loop_->PostTask(
       FROM_HERE, base::Bind(&IconLoader::NotifyDelegate, this));
 }