If user profile doesn't contain language setting, default to his Google account settings.

chrome/browser/profiles/off_the_record_profile_impl.cc

Index: chrome/browser/profiles/off_the_record_profile_impl.cc
diff --git a/chrome/browser/profiles/off_the_record_profile_impl.cc b/chrome/browser/profiles/off_the_record_profile_impl.cc
index 7f42c5d3d19ff5dc6aae4feddc243c4658442f24..1ad17a1ed400fc89e2f7997ae38cbab859d93891 100644
--- a/chrome/browser/profiles/off_the_record_profile_impl.cc
+++ b/chrome/browser/profiles/off_the_record_profile_impl.cc
@@ -405,8 +405,17 @@ void OffTheRecordProfileImpl::ChangeAppLocale(const std::string& locale,
                                               AppLocaleChangedVia) {
 }
 
+void OffTheRecordProfileImpl::MarkCreated() {
+}
+
 void OffTheRecordProfileImpl::OnLogin() {
 }
+
+void OffTheRecordProfileImpl::RespectLocalePreference() {
+}
+
+void OffTheRecordProfileImpl::SetGPlusProfileLocale(const std::string&) {
+}
 #endif  // defined(OS_CHROMEOS)
 
 PrefProxyConfigTracker* OffTheRecordProfileImpl::GetProxyConfigTracker() {
@@ -451,6 +460,13 @@ class GuestSessionProfile : public OffTheRecordProfileImpl {
     chromeos_preferences_->Init(static_cast<PrefServiceSyncable*>(GetPrefs()));
   }
 
+  virtual std::string GetGPlusLocale() const OVERRIDE {
+    return std::string();
+  }
+
+  virtual void SetGPlusProfileLocale(const std::string&) OVERRIDE {
+  }
+
  private:
   // The guest user should be able to customize Chrome OS preferences.
   scoped_ptr<chromeos::Preferences> chromeos_preferences_;