Move guest lifetime management to chrome

chrome/browser/guest_view/ad_view/ad_view_guest.cc

 // Copyright 2014 The Chromium 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 "chrome/browser/guest_view/ad_view/ad_view_guest.h"
 
 #include "base/strings/string_util.h"
 #include "chrome/browser/guest_view/ad_view/ad_view_constants.h"
 #include "chrome/browser/guest_view/guest_view_constants.h"
 #include "content/public/browser/web_contents.h"
 #include "net/base/net_errors.h"
 
 using content::WebContents;
 
 AdViewGuest::AdViewGuest(int guest_instance_id,
                          WebContents* guest_web_contents,
                          const std::string& extension_id)
     : GuestView<AdViewGuest>(guest_instance_id,
                              guest_web_contents,
-                             extension_id),
-      WebContentsObserver(guest_web_contents) {
+                             extension_id) {
 }
 
 // static
 const char AdViewGuest::Type[] = "adview";
 
 AdViewGuest::~AdViewGuest() {
 }
 
 void AdViewGuest::DidCommitProvisionalLoadForFrame(
     int64 frame_id,
@@ skipping 20 matching lines @@
   // Translate the |error_code| into an error string.
   std::string error_type;
   base::RemoveChars(net::ErrorToString(error_code), "net::", &error_type);
 
   scoped_ptr<base::DictionaryValue> args(new base::DictionaryValue());
   args->SetBoolean(guestview::kIsTopLevel, is_main_frame);
   args->SetString(guestview::kUrl, validated_url.spec());
   args->SetString(guestview::kReason, error_type);
   DispatchEvent(new GuestViewBase::Event(adview::kEventLoadAbort, args.Pass()));
 }