ui: Cleanup class/struct forward declarations

chrome/browser/policy/policy_browsertest.cc

Index: chrome/browser/policy/policy_browsertest.cc
diff --git a/chrome/browser/policy/policy_browsertest.cc b/chrome/browser/policy/policy_browsertest.cc
index a63248fd99875a03482fa26feeb0d24e8081fd1d..d1cc3f3bee9290db31b18e499ab9caa814c8e1c3 100644
--- a/chrome/browser/policy/policy_browsertest.cc
+++ b/chrome/browser/policy/policy_browsertest.cc
@@ -118,6 +118,7 @@
 #include "components/strings/grit/components_strings.h"
 #include "components/translate/core/browser/language_state.h"
 #include "components/translate/core/browser/translate_infobar_delegate.h"
+#include "components/update_client/update_client.h"
 #include "components/update_client/update_client_errors.h"
 #include "components/update_client/url_request_post_interceptor.h"
 #include "components/user_prefs/user_prefs.h"
@@ -3626,8 +3627,9 @@ update_client::CrxComponent ComponentUpdaterPolicyTest::MakeCrxComponent(
 
     MOCK_METHOD1(OnUpdateError, void(int error));
     MOCK_METHOD2(Install,
-                 bool(const base::DictionaryValue& manifest,
-                      const base::FilePath& unpack_path));
+                 update_client::CrxInstaller::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());