Add a preference to clear Flash LSO data in the Clear Browsing Data dialog.

chrome/browser/plugin_service.cc

 // Copyright (c) 2010 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 "build/build_config.h"
 
 #include "chrome/browser/plugin_service.h"
 
 #include "base/command_line.h"
 #include "base/path_service.h"
@@ skipping 195 matching lines @@
       return plugin;
   }
 
   return NULL;
 }
 
 PluginProcessHost* PluginService::FindOrStartPluginProcess(
     const FilePath& plugin_path) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 
+  if (plugin_path.value().empty())
+    return NULL;
+
   PluginProcessHost* plugin_host = FindPluginProcess(plugin_path);
   if (plugin_host)
     return plugin_host;
 
   WebPluginInfo info;
   if (!NPAPI::PluginList::Singleton()->GetPluginInfoByPath(
       plugin_path, &info)) {
     NOTREACHED();
     return NULL;
   }
@@ skipping 198 matching lines @@
     info.mime_types = ASCIIToWide(JoinString(plugins[i].mime_types, '|'));
 
     // These NPAPI entry points will never be called.  TODO(darin): Come up
     // with a cleaner way to register pepper plugins with the NPAPI PluginList,
     // or perhaps refactor the PluginList to be less specific to NPAPI.
     memset(&info.entry_points, 0, sizeof(info.entry_points));
 
     NPAPI::PluginList::Singleton()->RegisterInternalPlugin(info);
   }
 }