ui: Cleanup class/struct forward declarations

ios/chrome/browser/net/crl_set_fetcher.cc

Index: ios/chrome/browser/net/crl_set_fetcher.cc
diff --git a/ios/chrome/browser/net/crl_set_fetcher.cc b/ios/chrome/browser/net/crl_set_fetcher.cc
index 7fe5a9f6cfefcb4adea5b05395e75989f9648166..dd75b215a7eff001421212ddd6862c7d8ace8acc 100644
--- a/ios/chrome/browser/net/crl_set_fetcher.cc
+++ b/ios/chrome/browser/net/crl_set_fetcher.cc
@@ -7,6 +7,7 @@
 #include <stdint.h>
 
 #include "base/bind.h"
+#include "base/bind_helpers.h"
 #include "base/files/file_util.h"
 #include "base/numerics/safe_conversions.h"
 #include "base/rand_util.h"
@@ -15,6 +16,7 @@
 #include "base/trace_event/trace_event.h"
 #include "components/component_updater/component_updater_service.h"
 #include "components/update_client/update_client.h"
+#include "components/update_client/utils.h"
 #include "ios/chrome/browser/chrome_constants.h"
 #include "ios/web/public/web_thread.h"
 #include "net/cert/crl_set.h"
@@ -158,8 +160,16 @@ void CRLSetFetcher::OnUpdateError(int error) {
                << " from component installer";
 }
 
-bool CRLSetFetcher::Install(const base::DictionaryValue& manifest,
-                            const base::FilePath& unpack_path) {
+update_client::CrxInstaller::Result CRLSetFetcher::Install(
+    const base::DictionaryValue& manifest,
+    const base::FilePath& unpack_path) {
+  return update_client::InstallFunctionWrapper(
+      base::Bind(&CRLSetFetcher::DoInstall, base::Unretained(this),
+                 base::ConstRef(manifest), base::ConstRef(unpack_path)));
+}
+
+bool CRLSetFetcher::DoInstall(const base::DictionaryValue& manifest,
+                              const base::FilePath& unpack_path) {
   base::FilePath crl_set_file_path =
       unpack_path.Append(FILE_PATH_LITERAL("crl-set"));
   base::FilePath save_to = GetCRLSetFilePath();