MD Settings: fix help/ redirection to only happen on chrome://help

chrome/browser/chrome_content_browser_client.h

Index: chrome/browser/chrome_content_browser_client.h
diff --git a/chrome/browser/chrome_content_browser_client.h b/chrome/browser/chrome_content_browser_client.h
index df9919aa39b51ba8c5c620d611190eaeb24dc5a6..045c17ca0f56cdd4e2aeb5f410ece022cbb5721f 100644
--- a/chrome/browser/chrome_content_browser_client.h
+++ b/chrome/browser/chrome_content_browser_client.h
@@ -328,6 +328,11 @@ class ChromeContentBrowserClient : public content::ContentBrowserClient {
   CreateURLLoaderThrottles(
       const base::Callback<content::WebContents*()>& wc_getter) override;
 
+ protected:
+  static bool HandleWebUI(GURL* url, content::BrowserContext* browser_context);
+  static bool HandleWebUIReverse(GURL* url,
+                                 content::BrowserContext* browser_context);
+
  private:
   friend class DisableWebRtcEncryptionFlagTest;
   friend class InProcessBrowserTest;