Remove explicit tracking of guest view frames

This is no longer required now that we have implicit exclusion
of certain frame types including guest view frames.

Rename GuestView to ExcludedView in the renderer process.

libcef/browser/alloy/alloy_browser_host_impl.cc

@@ -16,6 +16,7 @@
 #include "libcef/browser/browser_info_manager.h"
 #include "libcef/browser/browser_platform_delegate.h"
 #include "libcef/browser/context.h"
+#include "libcef/browser/extensions/browser_extensions_util.h"
 #include "libcef/browser/hang_monitor.h"
 #include "libcef/browser/media_access_query.h"
 #include "libcef/browser/osr/osr_util.h"
@@ -604,9 +605,8 @@ void AlloyBrowserHostImpl::CancelContextMenu() {
 bool AlloyBrowserHostImpl::MaybeAllowNavigation(
     content::RenderFrameHost* opener,
     const content::OpenURLParams& params) {
-  bool is_guest_view = false;
-  GetFrameForHost(opener, &is_guest_view);
-
+  const bool is_guest_view = extensions::IsBrowserPluginGuest(
+      content::WebContents::FromRenderFrameHost(opener));
   if (is_guest_view && !params.is_pdf &&
       !params.url.SchemeIs(extensions::kExtensionScheme) &&
       !params.url.SchemeIs(content::kChromeUIScheme)) {