Implement HttpUserAgentSettings delegate for Android WebView

android_webview/native/aw_contents.h

Index: android_webview/native/aw_contents.h
diff --git a/android_webview/native/aw_contents.h b/android_webview/native/aw_contents.h
index 197f32e98e4c38b83ec59c2d7ca54288d9594f8c..7600051e5d0e22021fa0bfbf306b10847fd2fc6c 100644
--- a/android_webview/native/aw_contents.h
+++ b/android_webview/native/aw_contents.h
@@ -68,6 +68,8 @@ class AwContents : public FindHelper::Listener,
   // render_process_id and render_view_id, or NULL.
   static AwContents* FromID(int render_process_id, int render_view_id);
 
+  static std::string GetLocale();
+
   AwContents(scoped_ptr<content::WebContents> web_contents);
   ~AwContents() override;