<webview>: Implement WebRequest API

content/browser/browser_plugin/browser_plugin_guest.cc

Index: content/browser/browser_plugin/browser_plugin_guest.cc
diff --git a/content/browser/browser_plugin/browser_plugin_guest.cc b/content/browser/browser_plugin/browser_plugin_guest.cc
index d1c6caa70571d17934a403df875256317881262a..c7fe9fa9f74edbfdbe806c7098ac83573be976fa 100644
--- a/content/browser/browser_plugin/browser_plugin_guest.cc
+++ b/content/browser/browser_plugin/browser_plugin_guest.cc
@@ -275,7 +275,8 @@ BrowserPluginGuest::BrowserPluginGuest(
       pending_lock_request_(false),
       embedder_visible_(true),
       next_permission_request_id_(0),
-      has_render_view_(has_render_view) {
+      has_render_view_(has_render_view),
+      is_being_destroyed_(false) {
   DCHECK(web_contents);
   web_contents->SetDelegate(this);
   if (opener)
@@ -320,6 +321,9 @@ void BrowserPluginGuest::DestroyUnattachedWindows() {
 }
 
 void BrowserPluginGuest::Destroy() {
+  if (is_being_destroyed_)
+    return;
+  is_being_destroyed_ = true;
   if (!attached() && opener())
     opener()->pending_new_windows_.erase(this);
   DestroyUnattachedWindows();