Register a fake Flash with chrome://plugins during browser start-up.

chrome/browser/plugins/plugin_info_message_filter.cc

 // 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.
 
 #include "chrome/browser/plugins/plugin_info_message_filter.h"
 
 #include <stddef.h>
 
+#include <algorithm>
 #include <memory>
 #include <utility>
 
 #include "base/bind.h"
 #include "base/metrics/histogram.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/task_runner_util.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "build/build_config.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/content_settings/host_content_settings_map_factory.h"
 #include "chrome/browser/plugins/chrome_plugin_service_filter.h"
 #include "chrome/browser/plugins/plugin_filter_utils.h"
 #include "chrome/browser/plugins/plugin_finder.h"
 #include "chrome/browser/plugins/plugin_metadata.h"
 #include "chrome/browser/plugins/plugin_prefs.h"
 #include "chrome/browser/plugins/plugins_field_trial.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/browser_otr_state.h"
+#include "chrome/common/chrome_content_client.h"
 #include "chrome/common/pref_names.h"
 #include "chrome/common/render_messages.h"
 #include "components/component_updater/component_updater_service.h"
 #include "components/content_settings/core/browser/content_settings_utils.h"
 #include "components/content_settings/core/browser/host_content_settings_map.h"
 #include "components/content_settings/core/common/content_settings.h"
 #include "components/prefs/pref_service.h"
 #include "components/rappor/rappor_service.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/plugin_service.h"
@@ skipping 359 matching lines @@
     WebPluginInfo* plugin,
     std::string* actual_mime_type,
     std::unique_ptr<PluginMetadata>* plugin_metadata) const {
   *status = ChromeViewHostMsg_GetPluginInfo_Status::kAllowed;
 
   bool allow_wildcard = true;
   std::vector<WebPluginInfo> matching_plugins;
   std::vector<std::string> mime_types;
   PluginService::GetInstance()->GetPluginInfoArray(
       url, mime_type, allow_wildcard, &matching_plugins, &mime_types);
+#if defined(GOOGLE_CHROME_BUILD)
+  base::FilePath notPresent =

[Lei Zhang, 2016/08/30 00:17:57]

nit: not_present

[waffles, 2016/08/30 00:21:16]

Done.

+      base::FilePath::FromUTF8Unsafe(ChromeContentClient::kNotPresent);
+  matching_plugins.erase(
+      std::remove_if(
+          matching_plugins.begin(), matching_plugins.end(),
+          [&](const WebPluginInfo& info) { return info.path == notPresent; }),
+      matching_plugins.end());
+#endif  // defined(GOOGLE_CHROME_BUILD)
   if (matching_plugins.empty()) {
     *status = ChromeViewHostMsg_GetPluginInfo_Status::kNotFound;
     return false;
   }
 
   content::PluginServiceFilter* filter =
       PluginService::GetInstance()->GetFilter();
   size_t i = 0;
   for (; i < matching_plugins.size(); ++i) {
     if (!filter || filter->IsPluginAvailable(render_process_id_,
@@ skipping 67 matching lines @@
       status == ChromeViewHostMsg_GetPluginInfo_Status::kPlayImportantContent) {
     ChromePluginServiceFilter::GetInstance()->AuthorizePlugin(
         render_process_id_, path);
   }
 }
 
 bool PluginInfoMessageFilter::Context::IsPluginEnabled(
     const content::WebPluginInfo& plugin) const {
   return plugin_prefs_->IsPluginEnabled(plugin);
 }