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

chrome/common/render_messages.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Multiply-included file, no traditional include guard.
 #include <stdint.h>
 #include <string>
 #include <vector>
 
 #include "base/files/file_path.h"
@@ skipping 21 matching lines @@
 #include "url/ipc/url_param_traits.h"
 #include "url/origin.h"
 
 // Singly-included section for enums and custom IPC traits.
 #ifndef CHROME_COMMON_RENDER_MESSAGES_H_
 #define CHROME_COMMON_RENDER_MESSAGES_H_
 
 // These are only used internally, so the order does not matter.
 enum class ChromeViewHostMsg_GetPluginInfo_Status {
   kAllowed,
+  // Plugin is blocked, but still can be manually loaded via context menu.
   kBlocked,
+  // Plugin is blocked by policy, so it cannot be manually loaded.
   kBlockedByPolicy,
+  // Plugin is blocked, and cannot be manually loaded via context menu.
+  kBlockedNoLoading,
   kComponentUpdateRequired,
   kDisabled,
+  // Flash is blocked, but user can click on the placeholder to trigger the
+  // Flash permission prompt.
   kFlashHiddenPreferHtml,
   kNotFound,
   kOutdatedBlocked,
   kOutdatedDisallowed,
   kPlayImportantContent,
   kRestartRequired,
   kUnauthorized,
 };
 
 namespace IPC {
@@ skipping 538 matching lines @@
 
 #if BUILDFLAG(ENABLE_PLUGINS)
 // Sent by the renderer to check if crash reporting is enabled.
 IPC_SYNC_MESSAGE_CONTROL0_1(ChromeViewHostMsg_IsCrashReportingEnabled,
                             bool /* enabled */)
 #endif
 
 // Sent by the renderer to indicate that a fields trial has been activated.
 IPC_MESSAGE_CONTROL1(ChromeViewHostMsg_FieldTrialActivated,
                      std::string /* name */)