Implement the new Sync Confirmation dialog on Linux and Windows.

chrome/browser/chromeos/login/users/avatar/user_image_manager_impl.h

 // Copyright 2014 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_CHROMEOS_LOGIN_USERS_AVATAR_USER_IMAGE_MANAGER_IMPL_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_USERS_AVATAR_USER_IMAGE_MANAGER_IMPL_H_
 
 #include <map>
 #include <set>
 #include <string>
@@ skipping 68 matching lines @@
   // * Changes to User objects and local state are performed on the thread that
   //   |this| runs on.
   // * File writes and deletions are performed via |background_task_runner_|.
   //
   // With the above, it is guaranteed that any changes made by a canceled Job
   // cannot race against against changes made by the superseding Job.
   class Job;
 
   // ProfileDownloaderDelegate:
   bool NeedsProfilePicture() const override;
-  int GetDesiredImageSideLength() const override;
+  unsigned int GetDesiredImageSideLength() const override;
   Profile* GetBrowserProfile() override;
   std::string GetCachedPictureURL() const override;
   bool IsPreSignin() const override;
   void OnProfileDownloadSuccess(ProfileDownloader* downloader) override;
   void OnProfileDownloadFailure(
       ProfileDownloader* downloader,
       ProfileDownloaderDelegate::FailureReason reason) override;
 
   // Returns true if the user image for the user is managed by
   // policy and the user is not allowed to change it.
@@ skipping 119 matching lines @@
   bool user_needs_migration_;
 
   base::WeakPtrFactory<UserImageManagerImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(UserImageManagerImpl);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_USERS_AVATAR_USER_IMAGE_MANAGER_IMPL_H_