ui: Cleanup class/struct forward declarations

components/update_client/utils.cc

Index: components/update_client/utils.cc
diff --git a/components/update_client/utils.cc b/components/update_client/utils.cc
index 39ab431a7b5e4488512913777b2385f97f17a940..967b7ba05b63211113628dd9561654f6645f5bee 100644
--- a/components/update_client/utils.cc
+++ b/components/update_client/utils.cc
@@ -12,6 +12,7 @@
 #include <cstring>
 #include <vector>
 
+#include "base/callback.h"
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/files/memory_mapped_file.h"
@@ -27,6 +28,7 @@
 #include "components/update_client/configurator.h"
 #include "components/update_client/crx_update_item.h"
 #include "components/update_client/update_client.h"
+#include "components/update_client/update_client_errors.h"
 #include "components/update_client/update_query_params.h"
 #include "crypto/secure_hash.h"
 #include "crypto/sha2.h"
@@ -310,4 +312,9 @@ void RemoveUnsecureUrls(std::vector<GURL>* urls) {
               urls->end());
 }
 
+CrxInstaller::Result InstallFunctionWrapper(base::Callback<bool()> callback) {
+  return CrxInstaller::Result(callback.Run() ? InstallError::NONE
+                                             : InstallError::GENERIC_ERROR);
+}
+
 }  // namespace update_client