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

content/browser/tab_contents/web_drag_source_gtk.cc

Index: content/browser/tab_contents/web_drag_source_gtk.cc
===================================================================
--- content/browser/tab_contents/web_drag_source_gtk.cc	(revision 109608)
+++ content/browser/tab_contents/web_drag_source_gtk.cc	(working copy)
@@ -7,7 +7,7 @@
 #include <string>
 
 #include "base/file_util.h"
-#include "base/mime_util.h"
+#include "base/nix/mime_util_xdg.h"
 #include "base/threading/thread_restrictions.h"
 #include "base/utf_string_conversions.h"
 #include "content/browser/download/drag_download_file.h"
@@ -114,7 +114,7 @@
     // Looking up the mime type can hit the disk.  http://crbug.com/84896
     base::ThreadRestrictions::ScopedAllowIO allow_io;
     drag_file_mime_type_ = gdk_atom_intern(
-        mime_util::GetDataMimeType(drop_data.file_contents).c_str(), FALSE);
+        base::nix::GetDataMimeType(drop_data.file_contents).c_str(), FALSE);
     gtk_target_list_add(list, drag_file_mime_type_,
                         0, ui::CHROME_WEBDROP_FILE_CONTENTS);
   }