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

chrome/test/base/testing_profile.h

Index: chrome/test/base/testing_profile.h
diff --git a/chrome/test/base/testing_profile.h b/chrome/test/base/testing_profile.h
index 8e63e5a71b59aeb7cf6ee6d6ba8e24ca5b488e6a..7b708c24a69eaa2d6918eb1c28a730bc700cf018 100644
--- a/chrome/test/base/testing_profile.h
+++ b/chrome/test/base/testing_profile.h
@@ -257,8 +257,14 @@ class TestingProfile : public Profile {
   virtual void ChangeAppLocale(const std::string&,
                                AppLocaleChangedVia) OVERRIDE {
   }
+  virtual void MarkCreated() OVERRIDE {
+  }
   virtual void OnLogin() OVERRIDE {
   }
+  virtual void RespectLocalePreference() OVERRIDE {
+  }
+  virtual void SetGPlusProfileLocale(const std::string&) OVERRIDE {

[sky, 2013/08/23 16:02:56]

nit: style guide says always name parameters (257/258 is wrong too).

[Alexander Alekseev, 2013/09/06 19:52:08]

Done.

+  }
 #endif  // defined(OS_CHROMEOS)
 
   virtual PrefProxyConfigTracker* GetProxyConfigTracker() OVERRIDE;