Removed redundant PrintingUIWebContentsObserver.

BUG=374321

Review URL: https://codereview.chromium.org/506273004

Cr-Commit-Position: refs/heads/master@{#292022}

chrome/browser/printing/print_job_worker.cc

@@ -13,7 +13,6 @@
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/printing/print_job.h"
-#include "chrome/browser/printing/printing_ui_web_contents_observer.h"
 #include "chrome/grit/generated_resources.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/notification_service.h"
@@ -46,58 +45,33 @@ class PrintingContextDelegate : public PrintingContext::Delegate {
   virtual std::string GetAppLocale() OVERRIDE;
 
  private:
-  void InitOnUiThread(int render_process_id, int render_view_id);
-
-  scoped_ptr<PrintingUIWebContentsObserver> web_contents_observer_;
-  base::WeakPtrFactory<PrintingContextDelegate> weak_ptr_factory_;
+  int render_process_id_;
+  int render_view_id_;
 };
 
 PrintingContextDelegate::PrintingContextDelegate(int render_process_id,
                                                  int render_view_id)
-    : weak_ptr_factory_(this) {
-  InitOnUiThread(render_process_id, render_view_id);
+    : render_process_id_(render_process_id),
+      render_view_id_(render_view_id) {
 }
 
 PrintingContextDelegate::~PrintingContextDelegate() {
-  DCHECK_CURRENTLY_ON(BrowserThread::UI);
 }
 
 gfx::NativeView PrintingContextDelegate::GetParentView() {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
-  if (!web_contents_observer_)
+  content::RenderViewHost* view =
+      content::RenderViewHost::FromID(render_process_id_, render_view_id_);
+  if (!view)
     return NULL;
-  return web_contents_observer_->GetParentView();
+  content::WebContents* wc = content::WebContents::FromRenderViewHost(view);
+  return wc ? wc->GetNativeView() : NULL;
 }
 
 std::string PrintingContextDelegate::GetAppLocale() {
   return g_browser_process->GetApplicationLocale();
 }
 
-void PrintingContextDelegate::InitOnUiThread(int render_process_id,
-                                             int render_view_id) {
-  if (!BrowserThread::CurrentlyOn(BrowserThread::UI)) {
-    // All data initialized here should be accessed on UI thread. Because object
-    // is being constructed now, anything that is going to access
-    // PrintingContextDelegate on UI thread would be scheduled after the tasks
-    // below.
-    BrowserThread::PostTask(BrowserThread::UI,
-                            FROM_HERE,
-                            base::Bind(&PrintingContextDelegate::InitOnUiThread,
-                                       weak_ptr_factory_.GetWeakPtr(),
-                                       render_process_id,
-                                       render_view_id));
-    return;
-  }
-  content::RenderViewHost* view =
-      content::RenderViewHost::FromID(render_process_id, render_view_id);
-  if (!view)
-    return;
-  content::WebContents* wc = content::WebContents::FromRenderViewHost(view);
-  if (!wc)
-    return;
-  web_contents_observer_.reset(new PrintingUIWebContentsObserver(wc));
-}
-
 void NotificationCallback(PrintJobWorkerOwner* print_job,
                           JobEventDetails::Type detail_type,
                           PrintedDocument* document,

chrome/browser/printing/print_job_worker.h

@@ -132,9 +132,7 @@ class PrintJobWorker {
   void UseDefaultSettings();
 
   // Printing context delegate.
-  scoped_ptr<PrintingContext::Delegate,
-             content::BrowserThread::DeleteOnUIThread>
-      printing_context_delegate_;
+  scoped_ptr<PrintingContext::Delegate> printing_context_delegate_;
 
   // Information about the printer setting.
   scoped_ptr<PrintingContext> printing_context_;

chrome/browser/printing/printer_query.cc

@@ -10,7 +10,6 @@
 #include "base/threading/thread_restrictions.h"
 #include "base/values.h"
 #include "chrome/browser/printing/print_job_worker.h"
-#include "chrome/browser/printing/printing_ui_web_contents_observer.h"
 
 namespace printing {
 

chrome/browser/printing/printing_message_filter.cc

@@ -10,7 +10,6 @@
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/printing/print_job_manager.h"
 #include "chrome/browser/printing/printer_query.h"
-#include "chrome/browser/printing/printing_ui_web_contents_observer.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/profiles/profile_io_data.h"
 #include "chrome/common/print_messages.h"

chrome/browser/printing/printing_ui_web_contents_observer.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/printing_ui_web_contents_observer.h"
-
-#include "content/public/browser/browser_thread.h"
-#include "content/public/browser/web_contents.h"
-
-namespace printing {
-
-PrintingUIWebContentsObserver::PrintingUIWebContentsObserver(
-    content::WebContents* web_contents)
-    : content::WebContentsObserver(web_contents) {
-  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
-}
-
-PrintingUIWebContentsObserver::~PrintingUIWebContentsObserver() {
-  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
-}
-
-gfx::NativeView PrintingUIWebContentsObserver::GetParentView() {
-  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
-  return web_contents() ? web_contents()->GetNativeView() : NULL;
-}
-
-}  // namespace printing

chrome/browser/printing/printing_ui_web_contents_observer.h

-// 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.
-
-#ifndef CHROME_BROWSER_PRINTING_PRINTING_UI_WEB_CONTENTS_OBSERVER_H_
-#define CHROME_BROWSER_PRINTING_PRINTING_UI_WEB_CONTENTS_OBSERVER_H_
-
-#include "base/basictypes.h"
-#include "content/public/browser/web_contents_observer.h"
-#include "ui/gfx/native_widget_types.h"
-
-namespace printing {
-
-// Wrapper used to keep track of the lifetime of a WebContents.
-// Lives on the UI thread.
-class PrintingUIWebContentsObserver : public content::WebContentsObserver {
- public:
-  explicit PrintingUIWebContentsObserver(content::WebContents* web_contents);
-  virtual ~PrintingUIWebContentsObserver();
-
-  // Return the parent NativeView of the observed WebContents.
-  gfx::NativeView GetParentView();
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(PrintingUIWebContentsObserver);
-};
-
-}  // namespace printing
-
-#endif  // CHROME_BROWSER_PRINTING_PRINTING_UI_WEB_CONTENTS_OBSERVER_H_

chrome/chrome_browser.gypi

@@ -1874,8 +1874,6 @@
       'browser/printing/printer_query.h',
       'browser/printing/printing_message_filter.cc',
       'browser/printing/printing_message_filter.h',
-      'browser/printing/printing_ui_web_contents_observer.cc',
-      'browser/printing/printing_ui_web_contents_observer.h',
     ],
     # Used on top of the "basic" sources when enable_printing == 1 (full).
     'chrome_browser_full_printing_sources': [