Remove RenderViewHost parameter from WebContentsObserver::Did{Start|Stop}Loading.

chrome/browser/extensions/api/identity/web_auth_flow.cc

 // Copyright (c) 2012 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/extensions/api/identity/web_auth_flow.h"
 
 #include "base/base64.h"
 #include "base/location.h"
 #include "base/message_loop/message_loop.h"
 #include "base/strings/string_util.h"
@@ skipping 213 matching lines @@
   TRACE_EVENT_ASYNC_STEP_PAST1("identity",
                                "WebAuthFlow",
                                this,
                                "DidFailProvisionalLoad",
                                "error_code",
                                error_code);
   if (delegate_)
     delegate_->OnAuthFlowFailure(LOAD_FAILED);
 }
 
-void WebAuthFlow::DidStopLoading(RenderViewHost* render_view_host) {
+void WebAuthFlow::DidStopLoading() {
   AfterUrlLoaded();
 }
 
 void WebAuthFlow::DidNavigateMainFrame(
     const content::LoadCommittedDetails& details,
     const content::FrameNavigateParams& params) {
   if (delegate_ && details.http_status_code >= 400)
     delegate_->OnAuthFlowFailure(LOAD_FAILED);
 }
 
 }  // namespace extensions