Update our use of the NPAPI ClearSiteData API.

chrome/plugin/plugin_channel.cc

Index: chrome/plugin/plugin_channel.cc
diff --git a/chrome/plugin/plugin_channel.cc b/chrome/plugin/plugin_channel.cc
index 17f217d3951b14f396cba2ddd91fe8bd09d5745a..74a2ac0387c49615ffd6a8545a0407bd701631cd 100644
--- a/chrome/plugin/plugin_channel.cc
+++ b/chrome/plugin/plugin_channel.cc
@@ -253,8 +253,8 @@ int PluginChannel::GenerateRouteID() {
   return ++last_id;
 }
 
-void PluginChannel::OnClearSiteData(uint64 flags,
-                                    const std::string& domain,
+void PluginChannel::OnClearSiteData(const std::string& site,
+                                    uint64 flags,
                                     base::Time begin_time) {
   bool success = false;
   CommandLine* command_line = CommandLine::ForCurrentProcess();
@@ -264,10 +264,7 @@ void PluginChannel::OnClearSiteData(uint64 flags,
   if (plugin_lib.get()) {
     NPError err = plugin_lib->NP_Initialize();
     if (err == NPERR_NO_ERROR) {
-      scoped_refptr<webkit::npapi::PluginInstance> instance(
-          plugin_lib->CreateInstance(std::string()));
-
-      const char* domain_str = domain.empty() ? NULL : domain.c_str();
+      const char* site_str = site.empty() ? NULL : site.c_str();
       uint64 max_age;
       if (begin_time > base::Time()) {
         base::TimeDelta delta = base::Time::Now() - begin_time;
@@ -275,7 +272,7 @@ void PluginChannel::OnClearSiteData(uint64 flags,
       } else {
         max_age = kuint64max;
       }
-      err = instance->NPP_ClearSiteData(flags, domain_str, max_age);
+      err = plugin_lib->NP_ClearSiteData(site_str, flags, max_age);
       success = (err == NPERR_NO_ERROR);
     }
   }