Convert remaining WebContentsObservers loading callbacks to use RFH.

components/dom_distiller/content/web_contents_main_frame_observer.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 "components/dom_distiller/content/web_contents_main_frame_observer.h"
 
 #include "content/public/browser/navigation_details.h"
 #include "content/public/browser/render_frame_host.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/browser/web_contents_observer.h"
 #include "content/public/browser/web_contents_user_data.h"
 
 DEFINE_WEB_CONTENTS_USER_DATA_KEY(dom_distiller::WebContentsMainFrameObserver);
 
 namespace dom_distiller {
 
 WebContentsMainFrameObserver::WebContentsMainFrameObserver(
     content::WebContents* web_contents)
-    : is_document_loaded_in_main_frame_(false),
-      is_initialized_(false),
-      web_contents_(web_contents) {
+    : is_document_loaded_in_main_frame_(false), is_initialized_(false) {
   content::WebContentsObserver::Observe(web_contents);
 }
 
 WebContentsMainFrameObserver::~WebContentsMainFrameObserver() {
   CleanUp();
 }
 
 void WebContentsMainFrameObserver::DocumentLoadedInFrame(
-    int64 frame_id,
-    content::RenderViewHost* render_view_host) {
-  if (web_contents_ &&
-      frame_id == web_contents_->GetMainFrame()->GetRoutingID()) {
+    content::RenderFrameHost* render_frame_host) {
+  if (!render_frame_host->GetParent()) {
     is_document_loaded_in_main_frame_ = true;
   }
 }
 
 void WebContentsMainFrameObserver::DidNavigateMainFrame(
     const content::LoadCommittedDetails& details,
     const content::FrameNavigateParams& params) {
   if (details.is_main_frame) {
     is_document_loaded_in_main_frame_ = false;
     is_initialized_ = true;
   }
 }
 
 void WebContentsMainFrameObserver::RenderProcessGone(
     base::TerminationStatus status) {
   CleanUp();
 }
 
-void WebContentsMainFrameObserver::WebContentsDestroyed() {
-  CleanUp();
-}
-
 void WebContentsMainFrameObserver::CleanUp() {
   content::WebContentsObserver::Observe(NULL);
-  web_contents_ = NULL;
 }
 
 }  // namespace dom_distiller