Add method in WebView to notify about accept languages change.

public/web/WebView.h

Index: public/web/WebView.h
diff --git a/public/web/WebView.h b/public/web/WebView.h
index a9c1e3ef3ac94bf3b3d35b1c07c7ebf6c62bea78..769c67c36ffbd4b7ccaff3e9a8b5eff9db05f4d0 100644
--- a/public/web/WebView.h
+++ b/public/web/WebView.h
@@ -492,6 +492,13 @@ public:
     virtual void removePageOverlay(WebPageOverlay*) = 0;
 
 
+    // i18n -----------------------------------------------------------------
+
+    // Inform the WebView that the accept languages have changed.
+    // If the WebView wants to get the accept languages value, it will have
+    // to call the WebViewClient::acceptLanguages().
+    virtual void acceptLanguagesChanged() = 0;
+
     // Testing functionality for TestRunner ---------------------------------
 
 protected: