DevTools: request app banner from DevTools without #enable-add-to-shelf flag while emulating.

content/public/browser/web_contents_delegate.h

Index: content/public/browser/web_contents_delegate.h
diff --git a/content/public/browser/web_contents_delegate.h b/content/public/browser/web_contents_delegate.h
index 2c2ac7642e8b56552f985c13e8354fb3bac9f722..074333a1af8d0e000295ab7a049504a777f397cd 100644
--- a/content/public/browser/web_contents_delegate.h
+++ b/content/public/browser/web_contents_delegate.h
@@ -531,7 +531,7 @@ class CONTENT_EXPORT WebContentsDelegate {
       const std::vector<uint8_t>& proto) {}
 
   // Requests the app banner. This method is called from the DevTools.
-  virtual bool RequestAppBanner(content::WebContents* web_contents);
+  virtual void RequestAppBannerFromDevTools(content::WebContents* web_contents);
 
  protected:
   virtual ~WebContentsDelegate();