Disable "using base::FilePath" on Linux since it now compiles.

base/native_library_mac.mm

 // 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/native_library.h"
 
 #include <dlfcn.h>
 
 #include "base/file_path.h"
 #include "base/file_util.h"
 #include "base/mac/scoped_cftyperef.h"
 #include "base/string_util.h"
 #include "base/threading/thread_restrictions.h"
 #include "base/utf_string_conversions.h"
 
 namespace base {
 
 // static
-NativeLibrary LoadNativeLibrary(const FilePath& library_path,
+NativeLibrary LoadNativeLibrary(const base::FilePath& library_path,
                                 std::string* error) {
   // dlopen() etc. open the file off disk.
   if (library_path.Extension() == "dylib" ||
       !file_util::DirectoryExists(library_path)) {
     void* dylib = dlopen(library_path.value().c_str(), RTLD_LAZY);
     if (!dylib)
       return NULL;
     NativeLibrary native_lib = new NativeLibraryStruct();
     native_lib->type = DYNAMIC_LIB;
     native_lib->dylib = dylib;
@@ skipping 41 matching lines @@
   }
   return dlsym(library->dylib, name);
 }
 
 // static
 string16 GetNativeLibraryName(const string16& name) {
   return name + ASCIIToUTF16(".dylib");
 }
 
 }  // namespace base