Fix use-after-move in //components/optimization_guide/

Fix use-after-move (potential) bugs found by the
"bugprone-use-after-move" clang-tidy check.

Bug: 1122844
Change-Id: I3f3dab82cb743c4033bb3c562f9a7767341a7e9b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2382113Reviewed-by: Sophie Chang <sophiechang@chromium.org>
Commit-Queue: Maksim Ivanov <emaxx@chromium.org>
Cr-Commit-Position: refs/heads/master@{#802902}

components/optimization_guide/optimization_guide_store_unittest.cc

@@ -1629,7 +1629,7 @@ TEST_F(OptimizationGuideStoreTest, FetchHintsPurgeExpiredFetchedHints) {
   proto::Hint fetched_hint2;
   fetched_hint2.set_key("domain3.org");
   fetched_hint2.set_key_representation(proto::HOST);
-  fetched_hint1.mutable_max_cache_duration()->set_seconds(
+  fetched_hint2.mutable_max_cache_duration()->set_seconds(
       base::TimeDelta::FromDays(7).InSeconds());
   update_data->MoveHintIntoUpdateData(std::move(fetched_hint2));