[Android Webapps] Make AddToHomescreenDataFetcher easier to test

chrome/browser/android/webapps/add_to_homescreen_manager.h

Index: chrome/browser/android/webapps/add_to_homescreen_manager.h
diff --git a/chrome/browser/android/webapps/add_to_homescreen_manager.h b/chrome/browser/android/webapps/add_to_homescreen_manager.h
index 3d7af4db27b5e68a7d7b13db23242c301210deb1..7cdefa412c916f0ea2316066112e1b26f082e494 100644
--- a/chrome/browser/android/webapps/add_to_homescreen_manager.h
+++ b/chrome/browser/android/webapps/add_to_homescreen_manager.h
@@ -5,6 +5,8 @@
 #ifndef CHROME_BROWSER_ANDROID_WEBAPPS_ADD_TO_HOMESCREEN_MANAGER_H_
 #define CHROME_BROWSER_ANDROID_WEBAPPS_ADD_TO_HOMESCREEN_MANAGER_H_
 
+#include <memory>
+
 #include "base/android/jni_android.h"
 #include "base/android/scoped_java_ref.h"
 #include "base/macros.h"
@@ -14,7 +16,6 @@ namespace content {
 class WebContents;
 }
 
-class GURL;
 class SkBitmap;
 struct ShortcutInfo;
 
@@ -60,9 +61,6 @@ class AddToHomescreenManager : public AddToHomescreenDataFetcher::Observer {
   void OnDataAvailable(const ShortcutInfo& info,
                        const SkBitmap& primary_icon,
                        const SkBitmap& badge_icon) override;
-  SkBitmap FinalizeLauncherIconInBackground(const SkBitmap& icon,
-                                            const GURL& url,
-                                            bool* is_generated) override;
 
   // Points to the Java object.
   base::android::ScopedJavaGlobalRef<jobject> java_ref_;
@@ -71,7 +69,7 @@ class AddToHomescreenManager : public AddToHomescreenDataFetcher::Observer {
   bool is_webapk_compatible_;
 
   // Fetches data required to add a shortcut.
-  scoped_refptr<AddToHomescreenDataFetcher> data_fetcher_;
+  std::unique_ptr<AddToHomescreenDataFetcher> data_fetcher_;
 
   DISALLOW_COPY_AND_ASSIGN(AddToHomescreenManager);
 };