Clean up the IconLoader.

chrome/browser/icon_loader.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/icon_loader.h"
 
 #include "base/bind.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "content/public/browser/browser_thread.h"
 
 using content::BrowserThread;
 
-IconLoader::IconLoader(const base::FilePath& file_path,
+IconLoader::IconLoader(const IconGroup& group,
                        IconSize size,
                        Delegate* delegate)
-    : target_task_runner_(NULL),
-      file_path_(file_path),
+    : target_task_runner_(nullptr),
+      group_(group),
       icon_size_(size),
       delegate_(delegate) {}
 
 IconLoader::~IconLoader() {
 }
 
 void IconLoader::Start() {
   target_task_runner_ = base::ThreadTaskRunnerHandle::Get();
 
-  BrowserThread::PostTaskAndReply(BrowserThread::FILE, FROM_HERE,
-      base::Bind(&IconLoader::ReadGroup, this),
-      base::Bind(&IconLoader::OnReadGroup, this));
-}
-
-void IconLoader::ReadGroup() {
-  group_ = ReadGroupIDFromFilepath(file_path_);
-}
-
-void IconLoader::OnReadGroup() {
-  if (IsIconMutableFromFilepath(file_path_) ||
-      !delegate_->OnGroupLoaded(this, group_)) {
-    BrowserThread::PostTask(ReadIconThreadID(), FROM_HERE,
-        base::Bind(&IconLoader::ReadIcon, this));
-  }
+  BrowserThread::PostTask(ReadIconThreadID(), FROM_HERE,
+                          base::Bind(&IconLoader::ReadIcon, this));
 }
 
 void IconLoader::NotifyDelegate() {
-  // If the delegate takes ownership of the Image, release it from the scoped
-  // pointer.
-  if (delegate_->OnImageLoaded(this, image_.get(), group_))
-    ignore_result(image_.release());  // Can't ignore return value.
+  delegate_->OnImageLoaded(this, std::move(image_), group_);
 }