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.cc

@@ -0,0 +1,62 @@
+// 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.
+
+#include "cef/libcef/browser/browser_guest_util.h"
+
+#include "chrome/browser/browser_process.h"
+#include "chrome/browser/printing/print_preview_dialog_controller.h"
+#include "content/browser/browser_plugin/browser_plugin_guest.h"
+#include "content/browser/web_contents/web_contents_impl.h"
+
+namespace {
+
+content::WebContents* GetOwnerForBrowserPluginGuest(
+    const content::WebContents* guest) {
+  auto* guest_impl = static_cast<const content::WebContentsImpl*>(guest);
+  content::BrowserPluginGuest* plugin_guest =
+      guest_impl->GetBrowserPluginGuest();
+  if (plugin_guest) {
+    return plugin_guest->owner_web_contents();
+  }
+  return nullptr;
+}
+
+content::WebContents* GetInitiatorForPrintPreviewDialog(
+    const content::WebContents* guest) {
+  auto print_preview_controller =
+      g_browser_process->print_preview_dialog_controller();
+  return print_preview_controller->GetInitiator(
+      const_cast<content::WebContents*>(guest));
+}
+
+}  // namespace
+
+content::WebContents* GetOwnerForGuestContents(
+    const content::WebContents* guest) {
+  // Maybe it's a guest view. This occurs while loading the PDF viewer.
+  if (auto* owner = GetOwnerForBrowserPluginGuest(guest)) {
+    return owner;
+  }
+
+  // Maybe it's a print preview dialog. This occurs while loading the print
+  // preview dialog.
+  if (auto* initiator = GetInitiatorForPrintPreviewDialog(guest)) {
+    // Maybe the dialog is parented to a guest view. This occurs while loading
+    // the print preview dialog from inside the PDF viewer.
+    if (auto* owner = GetOwnerForBrowserPluginGuest(initiator)) {
+      return owner;
+    }
+    return initiator;
+  }
+
+  return nullptr;
+}
+
+bool IsBrowserPluginGuest(const content::WebContents* web_contents) {
+  return !!GetOwnerForBrowserPluginGuest(web_contents);
+}
+
+bool IsPrintPreviewDialog(const content::WebContents* web_contents) {
+  return !!GetInitiatorForPrintPreviewDialog(web_contents);
+}