CookieStore: Fix comment to match var name.

This change fixes the comment to reference the correct variable name.

Change-Id: I01d580306e1b10caf10e14f57c6efd927be53638
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1948958
Commit-Queue: Victor Costan <pwnall@chromium.org>
Reviewed-by: Victor Costan <pwnall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#721306}

content/browser/cookie_store/cookie_store_manager_unittest.cc

@@ -1650,7 +1650,7 @@ TEST_P(CookieStoreManagerTest, GetSubscriptionsFromWrongOrigin) {
 
 INSTANTIATE_TEST_SUITE_P(All,
                          CookieStoreManagerTest,
-                         testing::Bool() /* reset_storage_during_test */);
+                         testing::Bool() /* reset_context_during_test */);
 
 }  // namespace