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

chrome/browser/profiles/profile_downloader.h

Index: chrome/browser/profiles/profile_downloader.h
diff --git a/chrome/browser/profiles/profile_downloader.h b/chrome/browser/profiles/profile_downloader.h
index 952fd2e39b3bf7b733aa266192686f4ae8c6d3c6..326331c650431d6fe8eab9761f8bafc4efc44fb9 100644
--- a/chrome/browser/profiles/profile_downloader.h
+++ b/chrome/browser/profiles/profile_downloader.h
@@ -54,6 +54,9 @@ class ProfileDownloader : public net::URLFetcherDelegate,
   // if the name is "Pat Smith", the given name is "Pat".
   virtual string16 GetProfileGivenName() const;
 
+  // On successful download this returns G+ locale preference of the user.
+  virtual std::string GetProfileLocale() const;
+
   // On successful download this returns the profile picture of the user.
   // For users with no profile picture set (that is, they have the default
   // profile picture) this will return an Null bitmap.
@@ -90,15 +93,15 @@ class ProfileDownloader : public net::URLFetcherDelegate,
   virtual void OnGetTokenFailure(const OAuth2TokenService::Request* request,
                                  const GoogleServiceAuthError& error) OVERRIDE;
 
-  // Parses the entry response and gets the full name, the given name,
-  // and profile image URL. |data| should be the JSON formatted data returned
-  // by the response. Returns false to indicate a parsing error.
-  static bool GetProfileNameAndImageURL(const std::string& data,
-                                        string16* full_name,
-                                        string16* given_name,
-                                        std::string* url,
-                                        int image_size);
-
+  // Parses the entry response and gets the name, profile image URL and locale.
+  // |data| should be the JSON formatted data return by the response.
+  // Returns false to indicate a parsing error.
+  static bool ParseProfileJSON(const std::string& data,
+                               string16* full_name,
+                               string16* given_name,
+                               std::string* url,
+                               int image_size,
+                               std::string* profile_locale);
   // Returns true if the image url is url of the default profile picture.
   static bool IsDefaultProfileImageURL(const std::string& url);
 
@@ -119,6 +122,7 @@ class ProfileDownloader : public net::URLFetcherDelegate,
   scoped_ptr<OAuth2TokenService::Request> oauth2_access_token_request_;
   string16 profile_full_name_;
   string16 profile_given_name_;
+  std::string profile_locale_;
   SkBitmap profile_picture_;
   PictureStatus picture_status_;
   std::string picture_url_;