ui: Cleanup class/struct forward declarations

chrome/browser/component_updater/sw_reporter_installer_win.cc

Index: chrome/browser/component_updater/sw_reporter_installer_win.cc
diff --git a/chrome/browser/component_updater/sw_reporter_installer_win.cc b/chrome/browser/component_updater/sw_reporter_installer_win.cc
index fbec1455abdca8ea4065878038a74ecb71c41e41..5bd11650ce6241cfe54b3a4ddc7b268fb31beabd 100644
--- a/chrome/browser/component_updater/sw_reporter_installer_win.cc
+++ b/chrome/browser/component_updater/sw_reporter_installer_win.cc
@@ -312,10 +312,10 @@ bool SwReporterInstallerTraits::RequiresNetworkEncryption() const {
   return false;
 }
 
-bool SwReporterInstallerTraits::OnCustomInstall(
+update_client::CrxInstaller::Result SwReporterInstallerTraits::OnCustomInstall(
     const base::DictionaryValue& manifest,
     const base::FilePath& install_dir) {
-  return true;
+  return update_client::CrxInstaller::Result(0);
 }
 
 void SwReporterInstallerTraits::ComponentReady(