Move all blacklist checks for commit-time previews to commit

This does the move by removing the blacklist checks for commit-time
previews from the navigation start portion and will be checked for
real at ShouldCommitPreview

Bug: 1018799
Change-Id: I04248c87176376586c7ff07b8ff7c5bcea68c265
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1885637Reviewed-by: Doug Arnett <dougarnett@chromium.org>
Commit-Queue: Sophie Chang <sophiechang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710205}

components/previews/content/previews_decider_impl.cc

@@ -281,11 +281,9 @@ PreviewsEligibilityReason PreviewsDeciderImpl::DeterminePreviewEligibility(
         return PreviewsEligibilityReason::BLACKLIST_UNAVAILABLE;
       passed_reasons->push_back(
           PreviewsEligibilityReason::BLACKLIST_UNAVAILABLE);
-    }
 
-    // The blacklist will disallow certain hosts for periods of time based on
-    // user's opting out of the preview.
-    if (previews_black_list_) {
+      // The blacklist will disallow certain hosts for periods of time based on
+      // user's opting out of the preview.
       PreviewsEligibilityReason status =
           previews_black_list_->IsLoadedAndAllowed(
               url, type,

components/previews/content/previews_decider_impl_unittest.cc

@@ -2073,10 +2073,6 @@ TEST_F(PreviewsDeciderImplTest,
   std::vector<PreviewsEligibilityReason> checked_decisions = {
       PreviewsEligibilityReason::URL_HAS_BASIC_AUTH,
       PreviewsEligibilityReason::EXCLUDED_BY_MEDIA_SUFFIX,
-      PreviewsEligibilityReason::BLACKLIST_DATA_NOT_LOADED,
-      PreviewsEligibilityReason::USER_RECENTLY_OPTED_OUT,
-      PreviewsEligibilityReason::USER_BLACKLISTED,
-      PreviewsEligibilityReason::HOST_BLACKLISTED,
       PreviewsEligibilityReason::RELOAD_DISALLOWED,
   };
 
@@ -2300,10 +2296,6 @@ TEST_F(PreviewsDeciderImplTest, LogDecisionMadeAllowHintPreviewWithoutECT) {
   std::vector<PreviewsEligibilityReason> checked_decisions = {
       PreviewsEligibilityReason::URL_HAS_BASIC_AUTH,
       PreviewsEligibilityReason::EXCLUDED_BY_MEDIA_SUFFIX,
-      PreviewsEligibilityReason::BLACKLIST_DATA_NOT_LOADED,
-      PreviewsEligibilityReason::USER_RECENTLY_OPTED_OUT,
-      PreviewsEligibilityReason::USER_BLACKLISTED,
-      PreviewsEligibilityReason::HOST_BLACKLISTED,
       PreviewsEligibilityReason::RELOAD_DISALLOWED,
   };
   PreviewsUserData user_data(kDefaultPageId);