Remove unused Interests code.

chrome/browser/interests/interests_fetcher.h

-// Copyright 2015 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_INTERESTS_INTERESTS_FETCHER_H_
-#define CHROME_BROWSER_INTERESTS_INTERESTS_FETCHER_H_
-
-#include <memory>
-#include <string>
-#include <vector>
-
-#include "base/callback.h"
-#include "base/gtest_prod_util.h"
-#include "base/macros.h"
-#include "chrome/browser/profiles/profile.h"
-#include "components/signin/core/browser/signin_manager.h"
-#include "google_apis/gaia/oauth2_token_service.h"
-#include "net/url_request/url_fetcher.h"
-#include "net/url_request/url_fetcher_delegate.h"
-
-// Class to fetch topics of interest for a user as computed by Google Now. Each
-// interest is a tuple of a name, a thumbnail URL and a relevance score. This
-// class is one-shot. To retrieve interests multiple times use multiple
-// instances of this class.
-//
-// Authentication is done via OAuth2 and requires the
-// https://www.googleapis.com/auth/googlenow scope.
-//
-// If the InterestsFetcher is deleted before the callback is called then the
-// request will be aborted. It is up to the user to ensure that both the
-// Profile and the OAuth2TokenService outlive the InterestsFetcher.
-//
-// The server required for this feature is not publicly available yet.
-class InterestsFetcher : public net::URLFetcherDelegate,
-                         public OAuth2TokenService::Consumer {
- public:
-  struct Interest {
-    Interest(const std::string& name, const GURL& image_url, double relevance);
-    ~Interest();
-
-    bool operator==(const Interest& interest) const;
-
-    std::string name;
-    GURL image_url;
-    double relevance;
-  };
-
-  using InterestsCallback =
-      base::Callback<void(std::unique_ptr<std::vector<Interest>>)>;
-
-  InterestsFetcher(OAuth2TokenService* oauth2_token_service,
-                   const std::string& account_id,
-                   net::URLRequestContextGetter* context);
-
-  ~InterestsFetcher() override;
-
-  static std::unique_ptr<InterestsFetcher> CreateFromProfile(Profile* profile);
-
-  void FetchInterests(const InterestsCallback& callback);
-
- private:
-  // net::URLFetcherDelegate implementation.
-  void OnURLFetchComplete(const net::URLFetcher* source) override;
-
-  // OAuth2TokenService::Consumer implementation.
-  void OnGetTokenSuccess(const OAuth2TokenService::Request* request,
-                         const std::string& access_token,
-                         const base::Time& experiation_time) override;
-  void OnGetTokenFailure(const OAuth2TokenService::Request* request,
-                         const GoogleServiceAuthError& error) override;
-
-  void StartOAuth2Request();
-  OAuth2TokenService::ScopeSet GetApiScopes();
-  std::unique_ptr<net::URLFetcher> CreateFetcher();
-
-  // Parse the json response.
-  std::unique_ptr<std::vector<Interest>> ExtractInterests(
-      const std::string& response);
-
-  InterestsCallback callback_;
-  std::unique_ptr<net::URLFetcher> fetcher_;
-  std::string account_id_;
-  net::URLRequestContextGetter* url_request_context_;
-  bool access_token_expired_;
-  std::string access_token_;
-
-  std::unique_ptr<OAuth2TokenService::Request> oauth_request_;
-  OAuth2TokenService* token_service_;
-
-  DISALLOW_COPY_AND_ASSIGN(InterestsFetcher);
-};
-
-#endif  // CHROME_BROWSER_INTERESTS_INTERESTS_FETCHER_H_