Rename browser_extensions_util to browser_guest_util (seee #3685)

After Alloy bootstrap deletion the remaining functions are no longer
related to extensions. This change is a functional no-op.

libcef/browser/browser_guest_util.h

@@ -0,0 +1,20 @@
+// Copyright (c) 2015 The Chromium Embedded Framework Authors. All rights
+// reserved. Use of this source code is governed by a BSD-style license that
+// can be found in the LICENSE file.
+
+#ifndef CEF_LIBCEF_BROWSER_BROWSER_GUEST_UTIL_H_
+#define CEF_LIBCEF_BROWSER_BROWSER_GUEST_UTIL_H_
+
+namespace content {
+class WebContents;
+}  // namespace content
+
+// Returns the WebContents that owns the specified |guest|, if any.
+content::WebContents* GetOwnerForGuestContents(
+    const content::WebContents* guest);
+
+// Test for different types of guest contents.
+bool IsBrowserPluginGuest(const content::WebContents* web_contents);
+bool IsPrintPreviewDialog(const content::WebContents* web_contents);
+
+#endif  // CEF_LIBCEF_BROWSER_BROWSER_GUEST_UTIL_H_