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

components/component_updater/default_component_installer_unittest.cc

Index: components/component_updater/default_component_installer_unittest.cc
diff --git a/components/component_updater/default_component_installer_unittest.cc b/components/component_updater/default_component_installer_unittest.cc
index 604533228139e1154dfbd4f0e66884d30c5ef38d..432b41ba31ccb328944fa0ff1e73ca7ca8da3fea 100644
--- a/components/component_updater/default_component_installer_unittest.cc
+++ b/components/component_updater/default_component_installer_unittest.cc
@@ -82,10 +82,9 @@
 
   bool RequiresNetworkEncryption() const override { return true; }
 
-  update_client::CrxInstaller::Result OnCustomInstall(
-      const base::DictionaryValue& manifest,
-      const base::FilePath& install_dir) override {
-    return update_client::CrxInstaller::Result(0);
+  bool OnCustomInstall(const base::DictionaryValue& manifest,
+                       const base::FilePath& install_dir) override {
+    return true;
   }
 
   void ComponentReady(