[CodeHealth] Apply performance-move-const-arg (#26497)

This check has detected a few places where the use of `std::move` has
been completely misleading. In one of them we are potentially incurring
in a bug, as we are moving a shared callback that is being used in a
loop.

https://clang.llvm.org/extra/clang-tidy/checks/performance/move-const-arg.html

Resolves https://github.com/brave/brave-browser/issues/42230

components/https_upgrade_exceptions/browser/https_upgrade_exceptions_service.cc

@@ -51,7 +51,7 @@ void HttpsUpgradeExceptionsService::OnDATFileDataReady(
   }
   std::vector<std::string> lines = base::SplitString(
       contents, "\n", base::TRIM_WHITESPACE, base::SPLIT_WANT_NONEMPTY);
-  for (const auto& line : lines) {
+  for (auto&& line : lines) {
     exceptional_domains_.insert(std::move(line));
   }
   is_ready_ = true;