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

chrome/browser/printing/print_view_manager_base.cc

 // Copyright 2013 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/printing/print_view_manager_base.h"
 
 #include "base/bind.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/prefs/pref_service.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 184 matching lines @@
 }
 
 void PrintViewManagerBase::OnShowInvalidPrinterSettingsError() {
   chrome::ShowMessageBox(NULL,
                          base::string16(),
                          l10n_util::GetStringUTF16(
                              IDS_PRINT_INVALID_PRINTER_SETTINGS),
                          chrome::MESSAGE_BOX_TYPE_WARNING);
 }
 
-void PrintViewManagerBase::DidStartLoading(
-    content::RenderViewHost* render_view_host) {
+void PrintViewManagerBase::DidStartLoading() {
   UpdateScriptedPrintingBlocked();
 }
 
 bool PrintViewManagerBase::OnMessageReceived(const IPC::Message& message) {
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP(PrintViewManagerBase, message)
     IPC_MESSAGE_HANDLER(PrintHostMsg_DidGetPrintedPagesCount,
                         OnDidGetPrintedPagesCount)
     IPC_MESSAGE_HANDLER(PrintHostMsg_DidGetDocumentCookie,
                         OnDidGetDocumentCookie)
@@ skipping 298 matching lines @@
   scoped_refptr<printing::PrinterQuery> printer_query;
   printer_query = queue_->PopPrinterQuery(cookie);
   if (!printer_query.get())
     return;
   BrowserThread::PostTask(
       BrowserThread::IO, FROM_HERE,
       base::Bind(&PrinterQuery::StopWorker, printer_query.get()));
 }
 
 }  // namespace printing