Add static method WebApkIconHasher::DownloadAndComputeMurmur2Hash

chrome/browser/android/webapk/webapk_update_data_fetcher.h

 // Copyright 2016 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_ANDROID_WEBAPK_WEBAPK_UPDATE_DATA_FETCHER_H_
 #define CHROME_BROWSER_ANDROID_WEBAPK_WEBAPK_UPDATE_DATA_FETCHER_H_
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_weak_ref.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "chrome/browser/android/shortcut_info.h"
 #include "content/public/browser/web_contents_observer.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 
 namespace content {
 struct Manifest;
 class WebContents;
 }
 
 class GURL;
 struct InstallableData;
-class WebApkIconHasher;
 
 // WebApkUpdateDataFetcher is the C++ counterpart of
 // org.chromium.chrome.browser's WebApkUpdateDataFetcher in Java. It is created
 // via a JNI (Initialize) call and MUST BE DESTROYED via Destroy().
 class WebApkUpdateDataFetcher : public content::WebContentsObserver {
  public:
   WebApkUpdateDataFetcher(JNIEnv* env,
                           jobject obj,
                           const GURL& scope,
                           const GURL& web_manifest_url);
@@ skipping 46 matching lines @@
 
   // The WebAPK's Web Manifest URL that the detector is looking for.
   const GURL web_manifest_url_;
 
   // Whether this is the initial URL fetch.
   bool is_initial_fetch_;
 
   // The URL for which the installable data is being fetched / was last fetched.
   GURL last_fetched_url_;
 
-  // Downloads app icon and computes Murmur2 hash.
-  std::unique_ptr<WebApkIconHasher> icon_hasher_;
-
   // Downloaded data for |web_manifest_url_|.
   ShortcutInfo info_;
   SkBitmap best_primary_icon_;
 
   base::WeakPtrFactory<WebApkUpdateDataFetcher> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(WebApkUpdateDataFetcher);
 };
 
 #endif  // CHROME_BROWSER_ANDROID_WEBAPK_WEBAPK_UPDATE_DATA_FETCHER_H_