Linux: Move base/mime_util* to base/nix. It's not used on any other platform.

chrome/browser/icon_loader_linux.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 "chrome/browser/icon_loader.h"
 
 #include <string>
 
 #include "base/file_util.h"
 #include "base/logging.h"
 #include "base/message_loop.h"
-#include "base/mime_util.h"
+#include "base/nix/mime_util_xdg.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "webkit/glue/image_decoder.h"
 
 using std::string;
 
 void IconLoader::ReadIcon() {
   int size_pixels = 0;
   switch (icon_size_) {
     case IconLoader::SMALL:
       size_pixels = 16;
       break;
     case IconLoader::NORMAL:
       size_pixels = 32;
       break;
     case IconLoader::LARGE:
       size_pixels = 48;
       break;
     default:
       NOTREACHED();
   }
 
-  FilePath filename = mime_util::GetMimeIcon(group_, size_pixels);
+  FilePath filename = base::nix::GetMimeIcon(group_, size_pixels);
   string icon_data;
   file_util::ReadFileToString(filename, &icon_data);
 
   webkit_glue::ImageDecoder decoder;
   scoped_ptr<SkBitmap> bitmap(new SkBitmap());
   *bitmap = decoder.Decode(
       reinterpret_cast<const unsigned char*>(icon_data.data()),
       icon_data.length());
   if (!bitmap->empty()) {
     DCHECK_EQ(size_pixels, bitmap->width());
     DCHECK_EQ(size_pixels, bitmap->height());
     image_.reset(new gfx::Image(bitmap.release()));
   } else {
     LOG(WARNING) << "Unsupported file type or load error: " << filename.value();
   }
 
   target_message_loop_->PostTask(
       FROM_HERE, NewRunnableMethod(this, &IconLoader::NotifyDelegate));
 }