Make it possible to set the display mode from Chromium

content/public/browser/web_contents_delegate.cc

Index: content/public/browser/web_contents_delegate.cc
diff --git a/content/public/browser/web_contents_delegate.cc b/content/public/browser/web_contents_delegate.cc
index 0e48d7c346de405d682acfa5c08d42f16b310cf7..d4028fbefd6c1df08f130d9bf9a8ceed8a601114 100644
--- a/content/public/browser/web_contents_delegate.cc
+++ b/content/public/browser/web_contents_delegate.cc
@@ -151,6 +151,11 @@ bool WebContentsDelegate::IsFullscreenForTabOrPending(
   return false;
 }
 
+blink::WebDisplayMode WebContentsDelegate::GetDisplayMode(
+    const WebContents* web_contents) const {
+  return blink::WebDisplayModeBrowser;
+}
+
 content::ColorChooser* WebContentsDelegate::OpenColorChooser(
     WebContents* web_contents,
     SkColor color,