Replace std::find with base::Contains

Source code is much easier to write:
if (base::Contains(my_vector, my_search_value))

than:
if (std::find(my_vector.begin(), my_vector.end(), my_search_value)
 != my_vector.end())

Bug: 561800

Signed-off-by: Aquibuzzaman Md. Sayem <md.sayem@samsung.com>
Change-Id: I02f57383ecbfeb10dbc45155f3cf39b6069dbf29
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5034064
Commit-Queue: Maks Orlovich <morlovich@chromium.org>
Reviewed-by: Matt Menke <mmenke@chromium.org>
Reviewed-by: Caleb Raitto <caraitto@chromium.org>
Commit-Queue: Matt Menke <mmenke@chromium.org>
Reviewed-by: Maks Orlovich <morlovich@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1226216}

content/browser/interest_group/interest_group_browsertest.cc

@@ -1091,9 +1091,7 @@ class InterestGroupBrowserTest : public ContentBrowserTest {
         // Groups with different origins or joined by different origins should
         // not be modified in any way.
         EXPECT_EQ(group->bidding_browser_signals->join_count, final_join_count);
-      } else if (groups_to_keep &&
-                 std::find(groups_to_keep->begin(), groups_to_keep->end(),
-                           name) != groups_to_keep->end()) {
+      } else if (groups_to_keep && base::Contains(*groups_to_keep, name)) {
         // Interest groups that are excluded by name also should not be
         // modified.
         EXPECT_EQ(group->bidding_browser_signals->join_count, final_join_count);