[Android WebAPK] Make webapk_installer.cc return proto as base64 string

chrome/browser/android/webapk/webapk_install_service.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_INSTALL_SERVICE_H_
 #define CHROME_BROWSER_ANDROID_WEBAPK_WEBAPK_INSTALL_SERVICE_H_
 
 #include <map>
 #include <memory>
 #include <set>
 #include <string>
-#include <vector>
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "base/strings/string16.h"
 #include "components/keyed_service/core/keyed_service.h"
 #include "url/gurl.h"
 
 namespace content {
 class BrowserContext;
@@ skipping 41 matching lines @@
                     const SkBitmap& primary_icon,
                     const SkBitmap& badge_icon,
                     const FinishCallback& finish_callback);
 
   // Talks to the Chrome WebAPK server to update a WebAPK on the server and to
   // the Google Play server to install the downloaded WebAPK. Calls
   // |finish_callback| once the update completed or failed.
   void UpdateAsync(const std::string& webapk_package,
                    const GURL& start_url,
                    const base::string16& short_name,
-                   std::unique_ptr<std::vector<uint8_t>> serialized_proto,
+                   std::unique_ptr<std::string> serialized_proto,
                    const FinishCallback& finish_callback);
 
  private:
   // Called once the install/update completed or failed.
   void OnFinishedInstall(const GURL& web_manifest_url,
                          const FinishCallback& finish_callback,
                          WebApkInstallResult result,
                          bool relax_updates,
                          const std::string& webapk_package_name);
 
   content::BrowserContext* browser_context_;
 
   // In progress installs.
   std::set<GURL> installs_;
 
   // Used to get |weak_ptr_|.
   base::WeakPtrFactory<WebApkInstallService> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(WebApkInstallService);
 };
 
 #endif  // CHROME_BROWSER_ANDROID_WEBAPK_WEBAPK_INSTALL_SERVICE_H_