Deprecate file_util::AppendToPath() on non-Windows.

chrome/browser/chrome_plugin_host.cc

 // Copyright (c) 2009 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/chrome_plugin_host.h"
 
 #include <set>
 
 #include "base/basictypes.h"
 #include "base/command_line.h"
@@ skipping 443 matching lines @@
   switch (type) {
   case CPBROWSINGCONTEXT_DATA_DIR_PTR: {
     if (buf_size < sizeof(char*))
       return sizeof(char*);
 
     // TODO(mpcomplete): http://b/1143021 - When we support multiple profiles,
     // fetch the data dir from the context.
     PluginService* service = PluginService::GetInstance();
     if (!service)
       return CPERR_FAILURE;
-    std::wstring wretval = service->GetChromePluginDataDir().ToWStringHack();
-    file_util::AppendToPath(&wretval, chrome::kChromePluginDataDirname);
-    *static_cast<char**>(buf) = CPB_StringDup(CPB_Alloc, WideToUTF8(wretval));
+    FilePath path = service->GetChromePluginDataDir();
+    std::string retval = WideToUTF8(
+        path.Append(chrome::kChromePluginDataDirname).ToWStringHack());
+    *static_cast<char**>(buf) = CPB_StringDup(CPB_Alloc, retval);
     return CPERR_SUCCESS;
     }
   case CPBROWSINGCONTEXT_UI_LOCALE_PTR: {
     if (buf_size < sizeof(char*))
       return sizeof(char*);
 
     PluginService* service = PluginService::GetInstance();
     if (!service)
       return CPERR_FAILURE;
     const std::wstring& wretval = service->GetUILocale();
@@ skipping 338 matching lines @@
                      CPBrowsingContext context) {
   // Sadly if we try and pass context through, we seem to break cl's little
   // brain trying to compile the Tuple3 ctor. This cast works.
   int32 context_as_int32 = static_cast<int32>(context);
   // Plugins can only be accessed on the IO thread.
   ChromeThread::PostTask(
       ChromeThread::IO, FROM_HERE,
       NewRunnableFunction(PluginCommandHandler::HandleCommand,
                           command, data, context_as_int32));
 }