[Previews] Reporting non-opt outs to client blacklist

In a refactor from the InfoBar delegate into the PreviewsUITabHelper, we
stopped reporting non-opt outs to Previews code. This will break
Previews for all users in M71 once they dismiss enough previews (even if
we serve them a lot of Previews they do not dismiss).

Bug: 900711
Change-Id: I1f0e2da1c7421f3ec8668b79b09ad0367e4dce47
Reviewed-on: https://chromium-review.googlesource.com/c/1311118Reviewed-by: Tarun Bansal <tbansal@chromium.org>
Commit-Queue: Ryan Sturm <ryansturm@chromium.org>
Cr-Commit-Position: refs/heads/master@{#604396}

chrome/browser/previews/previews_ui_tab_helper.cc

@@ -93,7 +93,13 @@ bool ShouldShowUIForPreviewsType(previews::PreviewsType type) {
 
 }  // namespace
 
-PreviewsUITabHelper::~PreviewsUITabHelper() {}
+PreviewsUITabHelper::~PreviewsUITabHelper() {
+  // Report a non-opt out for the previous page if it was a preview and was not
+  // reloaded without previews.
+  if (!on_dismiss_callback_.is_null()) {
+    std::move(on_dismiss_callback_).Run(false);
+  }
+}
 
 PreviewsUITabHelper::PreviewsUITabHelper(content::WebContents* web_contents)
     : content::WebContentsObserver(web_contents), weak_factory_(this) {
@@ -240,6 +246,12 @@ void PreviewsUITabHelper::DidFinishNavigation(
       !navigation_handle->HasCommitted() || navigation_handle->IsSameDocument())
     return;
 
+  // Report a non-opt out for the previous page if it was a preview and was not
+  // reloaded without previews.
+  if (!on_dismiss_callback_.is_null()) {
+    std::move(on_dismiss_callback_).Run(false);
+  }
+
   previews_freshness_ = base::Time();
   previews_user_data_.reset();
 #if defined(OS_ANDROID)