[WebAPK] Refactor "unsigned sources" installation path

chrome/browser/android/webapk/webapk_installer_unittest.cc

Index: chrome/browser/android/webapk/webapk_installer_unittest.cc
diff --git a/chrome/browser/android/webapk/webapk_installer_unittest.cc b/chrome/browser/android/webapk/webapk_installer_unittest.cc
index ae4c1cc147d185979e3671fae360cb17a9727b4c..3b8997cd28b7d43bb58a9bac713630b635b694aa 100644
--- a/chrome/browser/android/webapk/webapk_installer_unittest.cc
+++ b/chrome/browser/android/webapk/webapk_installer_unittest.cc
@@ -66,18 +66,17 @@ class TestWebApkInstaller : public WebApkInstaller {
         can_use_google_play_install_service_(
             can_use_google_play_install_service) {}
 
-  bool StartInstallingDownloadedWebApk(
+  void InstallDownloadedWebApk(
       JNIEnv* env,
       const base::android::ScopedJavaLocalRef<jstring>& file_path,
       const base::android::ScopedJavaLocalRef<jstring>& package_name) override {
     PostTaskToRunSuccessCallback();
-    return true;
   }
 
-  bool StartUpdateUsingDownloadedWebApk(
+  void UpdateUsingDownloadedWebApk(
       JNIEnv* env,
       const base::android::ScopedJavaLocalRef<jstring>& file_path) override {
-    return true;
+    PostTaskToRunSuccessCallback();
   }
 
   bool CanUseGooglePlayInstallService() override {