chrome_paths: refactor and sanitize cache directory handling

chrome/common/chrome_paths_win.cc

 // Copyright (c) 2006-2008 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/common/chrome_paths_internal.h"
 
 #include <windows.h>
 #include <knownfolders.h>
 #include <shellapi.h>
 #include <shlobj.h>
@@ skipping 20 matching lines @@
   if (!PathService::Get(base::DIR_LOCAL_APP_DATA, result))
     return false;
 #if defined(GOOGLE_CHROME_BUILD)
   *result = result->Append(FILE_PATH_LITERAL("Google"));
 #endif
   *result = result->Append(L"Chrome Frame");
   *result = result->Append(chrome::kUserDataDirname);
   return true;
 }
 
+void GetUserCacheDirectory(const FilePath& profile_dir, FilePath* result) {
+  // This function does more complicated things on Mac/Linux.
+  *result = profile_dir;
+}
+
 bool GetUserDocumentsDirectory(FilePath* result) {
   wchar_t path_buf[MAX_PATH];
   if (FAILED(SHGetFolderPath(NULL, CSIDL_MYDOCUMENTS, NULL,
                              SHGFP_TYPE_CURRENT, path_buf)))
     return false;
   *result = FilePath(path_buf);
   return true;
 }
 
 // Return a default path for downloads that is safe.
@@ skipping 33 matching lines @@
   wchar_t system_buffer[MAX_PATH];
   system_buffer[0] = 0;
   if (FAILED(SHGetFolderPath(NULL, CSIDL_DESKTOPDIRECTORY, NULL,
                              SHGFP_TYPE_CURRENT, system_buffer)))
     return false;
   *result = FilePath(system_buffer);
   return true;
 }
 
 }  // namespace chrome