Add OS_CHROMEOS case in file_util::GetHomeDir()

chrome/browser/chromeos/gdata/gdata_cache.cc

Index: chrome/browser/chromeos/gdata/gdata_cache.cc
diff --git a/chrome/browser/chromeos/gdata/gdata_cache.cc b/chrome/browser/chromeos/gdata/gdata_cache.cc
index 889f7720aa301682601c8d407dada9662c66dda4..a76364b7e18a96b81c31549e113104b91e1d0329 100644
--- a/chrome/browser/chromeos/gdata/gdata_cache.cc
+++ b/chrome/browser/chromeos/gdata/gdata_cache.cc
@@ -38,20 +38,6 @@ const FilePath::CharType kGDataCacheTmpDownloadsDir[] =
 const FilePath::CharType kGDataCacheTmpDocumentsDir[] =
     FILE_PATH_LITERAL("tmp/documents");
 
-// Returns the home directory path, or an empty string if the home directory
-// is not found.
-// Copied from webkit/chromeos/cros_mount_point_provider.h.
-// TODO(satorux): Share the code.
-std::string GetHomeDirectory() {
-  if (base::chromeos::IsRunningOnChromeOS())
-    return "/home/chronos/user";
-
-  const char* home = getenv("HOME");
-  if (home)
-    return home;
-  return "";
-}
-
 // Used to tweak GetAmountOfFreeDiskSpace() behavior for testing.
 FreeDiskSpaceGetterInterface* global_free_disk_getter_for_testing = NULL;
 
@@ -62,7 +48,7 @@ int64 GetAmountOfFreeDiskSpace() {
     return global_free_disk_getter_for_testing->AmountOfFreeDiskSpace();
 
   return base::SysInfo::AmountOfFreeDiskSpace(
-      FilePath::FromUTF8Unsafe(GetHomeDirectory()));
+      FilePath::FromUTF8Unsafe(base::chromeos::GetHomeDirectory()));
 }
 
 // Returns true if we have sufficient space to store the given number of