ui: Cleanup class/struct forward declarations

components/component_updater/component_updater_service_unittest.cc

Index: components/component_updater/component_updater_service_unittest.cc
diff --git a/components/component_updater/component_updater_service_unittest.cc b/components/component_updater/component_updater_service_unittest.cc
index 091cf8da392e19998c1485a29acdf590d1798206..c4e6199e88d70171893216fd78f6c4e93c3ad7c3 100644
--- a/components/component_updater/component_updater_service_unittest.cc
+++ b/components/component_updater/component_updater_service_unittest.cc
@@ -30,6 +30,7 @@
 #include "testing/gtest/include/gtest/gtest.h"
 
 using Configurator = update_client::Configurator;
+using Result = update_client::CrxInstaller::Result;
 using TestConfigurator = update_client::TestConfigurator;
 using UpdateClient = update_client::UpdateClient;
 
@@ -47,8 +48,8 @@ class MockInstaller : public CrxInstaller {
 
   MOCK_METHOD1(OnUpdateError, void(int error));
   MOCK_METHOD2(Install,
-               bool(const base::DictionaryValue& manifest,
-                    const base::FilePath& unpack_path));
+               Result(const base::DictionaryValue& manifest,
+                      const base::FilePath& unpack_path));
   MOCK_METHOD2(GetInstalledFile,
                bool(const std::string& file, base::FilePath* installed_file));
   MOCK_METHOD0(Uninstall, bool());