Support uninstalling ARC app from Chrome launcher

chrome/browser/ui/app_list/arc/arc_app_utils.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_UI_APP_LIST_ARC_ARC_APP_UTILS_H_
 #define CHROME_BROWSER_UI_APP_LIST_ARC_ARC_APP_UTILS_H_
 
 #include <string>
 
 #include "base/callback.h"
 #include "ui/gfx/geometry/rect.h"
 
 namespace content {
 class BrowserContext;
 }
 
-namespace arc {
-using CanHandleResolutionCallback = base::Callback<void(bool)>;
+namespace mojo {
+class String;
 }
 
 namespace arc {
 
+using CanHandleResolutionCallback = base::Callback<void(bool)>;
+
 bool LaunchApp(content::BrowserContext* context, const std::string& app_id);
 
 // Tests if the application can use the given target resolution.
 // The callback will receive the information once known.
 // A false will get returned if the result cannot be determined in which case
 // the callback will not be called.
 bool CanHandleResolution(content::BrowserContext* context,
     const std::string& app_id,
     const gfx::Rect& rect,
-    const CanHandleResolutionCallback callback);
+    const CanHandleResolutionCallback& callback);
+
+// Uninstalls the package in ARC.
+void UninstallPackage(const std::string& package_name);
 
 }  // namespace arc
 
 #endif  // CHROME_BROWSER_UI_APP_LIST_ARC_ARC_APP_UTILS_H_