Revert of NTP Zombie Code Slayer Part IV: Most Visited

chrome/browser/search/thumbnail_source.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/search/thumbnail_source.h"
-
-#include "base/callback.h"
-#include "base/memory/ref_counted_memory.h"
-#include "base/message_loop/message_loop.h"
-#include "chrome/browser/search/instant_io_context.h"
-#include "chrome/browser/thumbnails/thumbnail_service.h"
-#include "chrome/browser/thumbnails/thumbnail_service_factory.h"
-#include "chrome/common/url_constants.h"
-#include "net/url_request/url_request.h"
-#include "url/gurl.h"
-
-// Set ThumbnailService now as Profile isn't thread safe.
-ThumbnailSource::ThumbnailSource(Profile* profile, bool capture_thumbnails)
-    : thumbnail_service_(ThumbnailServiceFactory::GetForProfile(profile)),
-      capture_thumbnails_(capture_thumbnails) {
-}
-
-ThumbnailSource::~ThumbnailSource() {
-}
-
-std::string ThumbnailSource::GetSource() const {
-  return capture_thumbnails_ ?
-      chrome::kChromeUIThumbnailHost2 : chrome::kChromeUIThumbnailHost;
-}
-
-void ThumbnailSource::StartDataRequest(
-    const std::string& path,
-    int render_process_id,
-    int render_frame_id,
-    const content::URLDataSource::GotDataCallback& callback) {
-  scoped_refptr<base::RefCountedMemory> data;
-  if (thumbnail_service_->GetPageThumbnail(GURL(path), capture_thumbnails_,
-                                           &data)) {
-    // We have the thumbnail.
-    callback.Run(data.get());
-  } else {
-    callback.Run(default_thumbnail_.get());
-  }
-  if (capture_thumbnails_)
-    thumbnail_service_->AddForcedURL(GURL(path));
-}
-
-std::string ThumbnailSource::GetMimeType(const std::string&) const {
-  // We need to explicitly return a mime type, otherwise if the user tries to
-  // drag the image they get no extension.
-  return "image/png";
-}
-
-base::MessageLoop* ThumbnailSource::MessageLoopForRequestPath(
-    const std::string& path) const {
-  // TopSites can be accessed from the IO thread.
-  return thumbnail_service_.get() ?
-      NULL : content::URLDataSource::MessageLoopForRequestPath(path);
-}
-
-bool ThumbnailSource::ShouldServiceRequest(
-    const net::URLRequest* request) const {
-  if (request->url().SchemeIs(chrome::kChromeSearchScheme))
-    return InstantIOContext::ShouldServiceRequest(request);
-  return URLDataSource::ShouldServiceRequest(request);
-}