Clean up TCW, make it solely a hub for 1:1 observer/helper objects.

chrome/browser/printing/print_preview_message_handler.cc

 // Copyright (c) 2011 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_preview_message_handler.h"
 
 #include <vector>
 
 #include "base/bind.h"
 #include "base/memory/ref_counted.h"
@@ skipping 73 matching lines @@
   return TabContentsWrapper::GetCurrentWrapperForContents(tab_contents());
 }
 
 PrintPreviewUI* PrintPreviewMessageHandler::OnFailure(int document_cookie) {
   // Always need to stop the worker.
   StopWorker(document_cookie);
 
   // Inform the print preview tab of the failure.
   TabContentsWrapper* print_preview_tab = GetPrintPreviewTab();
   // User might have closed it already.
-  if (!print_preview_tab || !print_preview_tab->web_ui())
+  if (!print_preview_tab || !print_preview_tab->tab_contents()->web_ui())
     return NULL;
 
-  return static_cast<PrintPreviewUI*>(print_preview_tab->web_ui());
+  return static_cast<PrintPreviewUI*>(
+      print_preview_tab->tab_contents()->web_ui());
 }
 
 void PrintPreviewMessageHandler::OnRequestPrintPreview(
     bool source_is_modifiable) {
   PrintPreviewTabController::PrintPreview(tab_contents_wrapper());
   PrintPreviewUI::SetSourceIsModifiable(GetPrintPreviewTab(),
                                         source_is_modifiable);
 }
 
 void PrintPreviewMessageHandler::OnDidGetPreviewPageCount(
     const PrintHostMsg_DidGetPreviewPageCount_Params& params) {
   if (params.page_count <= 0) {
     NOTREACHED();
     return;
   }
 
   TabContentsWrapper* print_preview_tab = GetPrintPreviewTab();
-  if (!print_preview_tab || !print_preview_tab->web_ui())
+  if (!print_preview_tab || !print_preview_tab->tab_contents()->web_ui())
     return;
 
   PrintPreviewUI* print_preview_ui =
-      static_cast<PrintPreviewUI*>(print_preview_tab->web_ui());
+      static_cast<PrintPreviewUI*>(print_preview_tab->tab_contents()->web_ui());
 
   if (!params.is_modifiable || params.clear_preview_data)
     print_preview_ui->ClearAllPreviewData();
 
   print_preview_ui->OnDidGetPreviewPageCount(params);
 }
 
 void PrintPreviewMessageHandler::OnDidPreviewPage(
     const PrintHostMsg_DidPreviewPage_Params& params) {
   TabContentsWrapper* print_preview_tab = GetPrintPreviewTab();
-  if (!print_preview_tab || !print_preview_tab->web_ui())
+  if (!print_preview_tab || !print_preview_tab->tab_contents()->web_ui())
     return;
 
   PrintPreviewUI* print_preview_ui =
-      static_cast<PrintPreviewUI*>(print_preview_tab->web_ui());
+      static_cast<PrintPreviewUI*>(print_preview_tab->tab_contents()->web_ui());
   int page_number = params.page_number;
   if (page_number >= FIRST_PAGE_INDEX && params.data_size) {
     RefCountedBytes* data_bytes =
         GetDataFromHandle(params.metafile_data_handle, params.data_size);
     DCHECK(data_bytes);
 
     print_preview_ui->SetPrintPreviewDataForIndex(page_number, data_bytes);
     print_preview_ui->OnDidPreviewPage(page_number, params.preview_request_id);
   }
 }
 
 void PrintPreviewMessageHandler::OnMetafileReadyForPrinting(
     const PrintHostMsg_DidPreviewDocument_Params& params) {
   // Always try to stop the worker.
   StopWorker(params.document_cookie);
 
   if (params.expected_pages_count <= 0) {
     NOTREACHED();
     return;
   }
 
   // Get the print preview tab.
   TabContentsWrapper* print_preview_tab = GetPrintPreviewTab();
   // User might have closed it already.
-  if (!print_preview_tab || !print_preview_tab->web_ui())
+  if (!print_preview_tab || !print_preview_tab->tab_contents()->web_ui())
     return;
 
   PrintPreviewUI* print_preview_ui =
-      static_cast<PrintPreviewUI*>(print_preview_tab->web_ui());
+      static_cast<PrintPreviewUI*>(print_preview_tab->tab_contents()->web_ui());
 
   if (params.reuse_existing_data) {
     // Need to match normal rendering where we are expected to send this.
     PrintHostMsg_DidGetPreviewPageCount_Params temp_params;
     temp_params.page_count = params.expected_pages_count;
     temp_params.document_cookie = params.document_cookie;
     temp_params.is_modifiable = params.modifiable;
     temp_params.preview_request_id = params.preview_request_id;
     print_preview_ui->OnDidGetPreviewPageCount(temp_params);
     print_preview_ui->OnReusePreviewData(params.preview_request_id);
@@ skipping 17 matching lines @@
 void PrintPreviewMessageHandler::OnPrintPreviewFailed(int document_cookie) {
   PrintPreviewUI* print_preview_ui = OnFailure(document_cookie);
   if (!print_preview_ui)
     return;
   print_preview_ui->OnPrintPreviewFailed();
 }
 
 void PrintPreviewMessageHandler::OnDidGetDefaultPageLayout(
     const PageSizeMargins& page_layout_in_points) {
   TabContentsWrapper* print_preview_tab = GetPrintPreviewTab();
-  if (!print_preview_tab || !print_preview_tab->web_ui())
+  if (!print_preview_tab || !print_preview_tab->tab_contents()->web_ui())
     return;
 
   PrintPreviewUI* print_preview_ui =
-      static_cast<PrintPreviewUI*>(print_preview_tab->web_ui());
+      static_cast<PrintPreviewUI*>(print_preview_tab->tab_contents()->web_ui());
   print_preview_ui->OnDidGetDefaultPageLayout(page_layout_in_points);
 }
 
 void PrintPreviewMessageHandler::OnPrintPreviewCancelled(int document_cookie) {
   // Always need to stop the worker.
   StopWorker(document_cookie);
 }
 
 void PrintPreviewMessageHandler::OnInvalidPrinterSettings(int document_cookie) {
   PrintPreviewUI* print_preview_ui = OnFailure(document_cookie);
@@ skipping 39 matching lines @@
     return;
   }
   // If |tab| is navigating and it has a print preview tab, notify |tab| to
   // consider print preview done so it unfreezes the renderer in the case of
   // window.print().
   if (preview_tab)
     tab->print_view_manager()->PrintPreviewDone();
 }
 
 }  // namespace printing