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

components/component_updater/default_component_installer_unittest.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <iterator>
 #include <string>
 #include <utility>
 #include <vector>
 
 #include "base/callback.h"
@@ skipping 64 matching lines @@
                           const base::FilePath& dir) const override {
     return true;
   }
 
   bool SupportsGroupPolicyEnabledComponentUpdates() const override {
     return true;
   }
 
   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(
       const base::Version& version,
       const base::FilePath& install_dir,
       std::unique_ptr<base::DictionaryValue> manifest) override {}
 
   base::FilePath GetRelativeInstallDir() const override {
     return base::FilePath(FILE_PATH_LITERAL("fake"));
   }
@@ skipping 129 matching lines @@
       component.pk_hash);
   EXPECT_EQ(base::Version("0.0.0.0"), component.version);
   EXPECT_TRUE(component.fingerprint.empty());
   EXPECT_STREQ("fake name", component.name.c_str());
   EXPECT_EQ(expected_attrs, component.installer_attributes);
   EXPECT_TRUE(component.requires_network_encryption);
   EXPECT_TRUE(component.supports_group_policy_enable_component_updates);
 }
 
 }  // namespace component_updater