ui: Cleanup class/struct forward declarations

chrome/browser/component_updater/sw_reporter_installer_win.h

Index: chrome/browser/component_updater/sw_reporter_installer_win.h
diff --git a/chrome/browser/component_updater/sw_reporter_installer_win.h b/chrome/browser/component_updater/sw_reporter_installer_win.h
index e816b0db0878a2c8515e0190e782195089a1a73e..786adb4023b374b77b928b5090115b6996e655fa 100644
--- a/chrome/browser/component_updater/sw_reporter_installer_win.h
+++ b/chrome/browser/component_updater/sw_reporter_installer_win.h
@@ -56,8 +56,9 @@ class SwReporterInstallerTraits : public ComponentInstallerTraits {
                           const base::FilePath& dir) const override;
   bool SupportsGroupPolicyEnabledComponentUpdates() const override;
   bool RequiresNetworkEncryption() const override;
-  bool OnCustomInstall(const base::DictionaryValue& manifest,
-                       const base::FilePath& install_dir) override;
+  update_client::CrxInstaller::Result OnCustomInstall(
+      const base::DictionaryValue& manifest,
+      const base::FilePath& install_dir) override;
   void ComponentReady(const base::Version& version,
                       const base::FilePath& install_dir,
                       std::unique_ptr<base::DictionaryValue> manifest) override;