Relanding this as the previous attempt failed due to build errors.

webkit/plugins/npapi/plugin_utils.cc

 // Copyright (c) 2011 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 "webkit/plugins/npapi/plugin_utils.h"
 
 #include <algorithm>
 
 #include "base/string_util.h"
 #include "base/strings/string_split.h"
 #include "base/version.h"
 
 namespace webkit {
 namespace npapi {
 
+// Global variable used by the plugin quirk "die after unload".
+bool g_forcefully_terminate_plugin_process = false;
+
 void CreateVersionFromString(const base::string16& version_string,
                              Version* parsed_version) {
   // Remove spaces and ')' from the version string,
   // Replace any instances of 'r', ',' or '(' with a dot.
   std::string version = UTF16ToASCII(version_string);
   RemoveChars(version, ") ", &version);
   std::replace(version.begin(), version.end(), 'd', '.');
   std::replace(version.begin(), version.end(), 'r', '.');
   std::replace(version.begin(), version.end(), ',', '.');
   std::replace(version.begin(), version.end(), '(', '.');
@@ skipping 19 matching lines @@
 }
 
 bool NPAPIPluginsSupported() {
 #if defined(OS_WIN) || defined(OS_MACOSX) || (defined(OS_LINUX) && !defined(USE_AURA))
   return true;
 #else
   return false;
 #endif
 }
 
+void SetForcefullyTerminatePluginProcess(bool value) {
+  g_forcefully_terminate_plugin_process = value;
+}
+
+bool ShouldForcefullyTerminatePluginProcess() {
+  return g_forcefully_terminate_plugin_process;
+}
+
 }  // namespace npapi
 }  // namespace webkit