[HBD] Fix the misleading no-fallback placeholder message in BLOCK mode.

chrome/browser/plugins/plugin_info_message_filter.cc

Index: chrome/browser/plugins/plugin_info_message_filter.cc
diff --git a/chrome/browser/plugins/plugin_info_message_filter.cc b/chrome/browser/plugins/plugin_info_message_filter.cc
index 2fdaaeabc89fb2608d6e93f2ccbd7398afef2c31..5954a6c62b739adfe05dea35d56e22696cb49d31 100644
--- a/chrome/browser/plugins/plugin_info_message_filter.cc
+++ b/chrome/browser/plugins/plugin_info_message_filter.cc
@@ -334,6 +334,16 @@ void PluginInfoMessageFilter::Context::DecidePluginStatus(
   DCHECK(plugin_setting != CONTENT_SETTING_DEFAULT);
   DCHECK(plugin_setting != CONTENT_SETTING_ASK);
 
+  if (*status ==
+      ChromeViewHostMsg_GetPluginInfo_Status::kFlashHiddenPreferHtml) {
+    if (plugin_setting == CONTENT_SETTING_BLOCK) {
+      *status = is_managed && !legacy_ask_user
+                    ? ChromeViewHostMsg_GetPluginInfo_Status::kBlockedByPolicy
+                    : ChromeViewHostMsg_GetPluginInfo_Status::kBlockedNoLoading;
+    }
+    return;
+  }
+
 #if BUILDFLAG(ENABLE_PLUGIN_INSTALLATION)
   // Check if the plugin is outdated.
   if (plugin_status == PluginMetadata::SECURITY_STATUS_OUT_OF_DATE &&
@@ -455,6 +465,10 @@ bool PluginInfoMessageFilter::Context::FindEnabledPlugin(
       // via chrome://plugins. That should be fine since chrome://plugins is
       // going away, but we should verify before launching HBD.
       *status = ChromeViewHostMsg_GetPluginInfo_Status::kFlashHiddenPreferHtml;
+
+      // In the Prefer HTML case, the plugin is actually enabled, but hidden.
+      // It will still be blocked in the body of DecidePluginStatus.
+      enabled = true;
     }
   }