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

chrome/browser/plugin_service.cc

Index: chrome/browser/plugin_service.cc
diff --git a/chrome/browser/plugin_service.cc b/chrome/browser/plugin_service.cc
index e3e23fdece9fe0d3c9aa0c55d5fbe69f09bd6ddc..14ca3d8e6a6d6332a8d9ce8524f9d4bd31e95bcc 100644
--- a/chrome/browser/plugin_service.cc
+++ b/chrome/browser/plugin_service.cc
@@ -213,6 +213,9 @@ 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;