Revert of Makes the component installers return a Result instead of a bool.

chrome/browser/component_updater/sth_set_component_installer.cc

Index: chrome/browser/component_updater/sth_set_component_installer.cc
diff --git a/chrome/browser/component_updater/sth_set_component_installer.cc b/chrome/browser/component_updater/sth_set_component_installer.cc
index b1b06d3f2412e2093cb5565cd82b219c394528c1..f6ac974ee3dd6071f89fbeaa57ace29b27826761 100644
--- a/chrome/browser/component_updater/sth_set_component_installer.cc
+++ b/chrome/browser/component_updater/sth_set_component_installer.cc
@@ -65,11 +65,10 @@
   return false;
 }
 
-update_client::CrxInstaller::Result
-STHSetComponentInstallerTraits::OnCustomInstall(
+bool STHSetComponentInstallerTraits::OnCustomInstall(
     const base::DictionaryValue& manifest,
     const base::FilePath& install_dir) {
-  return update_client::CrxInstaller::Result(0);  // Nothing custom here.
+  return true;  // Nothing custom here.
 }
 
 void STHSetComponentInstallerTraits::ComponentReady(