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

chrome/browser/android/webapk/webapk_install_service.h

Index: chrome/browser/android/webapk/webapk_install_service.h
diff --git a/chrome/browser/android/webapk/webapk_install_service.h b/chrome/browser/android/webapk/webapk_install_service.h
index 6134f08b2131d037a77439960e1322cddb543b2d..a478c211afc45e8a99dbab4f5c14a6328593a7d2 100644
--- a/chrome/browser/android/webapk/webapk_install_service.h
+++ b/chrome/browser/android/webapk/webapk_install_service.h
@@ -18,6 +18,10 @@
 #include "components/keyed_service/core/keyed_service.h"
 #include "url/gurl.h"
 
+namespace base {
+class FilePath;
+}
+
 namespace content {
 class BrowserContext;
 }
@@ -66,12 +70,10 @@ class WebApkInstallService : public KeyedService {
                     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,
+  // the Google Play server to install the downloaded WebAPK.
+  // |update_request_file_path| is the path of the file with the update request.
+  // Calls |finish_callback| once the update completed or failed.
+  void UpdateAsync(const base::FilePath& update_request_file,
                    const FinishCallback& finish_callback);
 
  private: