Add OS_CHROMEOS case in file_util::GetHomeDir()

base/chromeos/chromeos_version.cc

Index: base/chromeos/chromeos_version.cc
diff --git a/base/chromeos/chromeos_version.cc b/base/chromeos/chromeos_version.cc
index 4a70cd5312aad80213e9eb3cdd7c9e6ec420411b..a4587c6ad3264c9e739b3b03996cf6c57c985007 100644
--- a/base/chromeos/chromeos_version.cc
+++ b/base/chromeos/chromeos_version.cc
@@ -20,5 +20,15 @@ bool IsRunningOnChromeOS() {
   return user && strcmp(user, "chronos") == 0;
 }
 
+std::string GetHomeDirectory() {
+  if (IsRunningOnChromeOS())
+    return "/home/chronos/user";
+
+  const char* home = getenv("HOME");
+  if (home)
+    return home;
+  return "";
+}
+
 }  // namespace chromeos
 }  // namespace base