Ignore viewport meta tags when Request Desktop Site is enabled.

content/browser/renderer_host/render_view_host_delegate.h

Index: content/browser/renderer_host/render_view_host_delegate.h
diff --git a/content/browser/renderer_host/render_view_host_delegate.h b/content/browser/renderer_host/render_view_host_delegate.h
index 8fc436c252598f4e4d00a997661f054559cfe711..87fb010ed95ee5612bbb8eab5c7ac5671d127465 100644
--- a/content/browser/renderer_host/render_view_host_delegate.h
+++ b/content/browser/renderer_host/render_view_host_delegate.h
@@ -237,6 +237,10 @@ class CONTENT_EXPORT RenderViewHostDelegate {
   virtual void SetIsVirtualKeyboardRequested(bool requested) {}
   virtual bool IsVirtualKeyboardRequested();
 
+  // Whether the user agent is overridden using the Android "Request Desktop
+  // Site" feature.
+  virtual bool IsOverridingUserAgent();
+
  protected:
   virtual ~RenderViewHostDelegate() {}
 };