Convert the PluginService interface to be an async wrapper around PluginList.

chrome/browser/extensions/extension_content_settings_apitest.cc

Index: chrome/browser/extensions/extension_content_settings_apitest.cc
diff --git a/chrome/browser/extensions/extension_content_settings_apitest.cc b/chrome/browser/extensions/extension_content_settings_apitest.cc
index 3294c23e777fe2f77382084b44ab589a18b6272d..cae206cc5ec5342b8f7bf00b5f261afda7f3f513 100644
--- a/chrome/browser/extensions/extension_content_settings_apitest.cc
+++ b/chrome/browser/extensions/extension_content_settings_apitest.cc
@@ -117,10 +117,14 @@ IN_PROC_BROWSER_TEST_F(ExtensionApiTest,
                             FilePath(kBarPath),
                             ASCIIToUTF16("2.3.4"),
                             ASCIIToUTF16("bar")));
-  GetResourceIdentifiersFunction::SetPluginListForTesting(&plugin_list);
+
+  std::vector<webkit::npapi::PluginGroup> groups;
+  plugin_list.GetPluginGroups(true, &groups);
+
+  GetResourceIdentifiersFunction::SetPluginGroupsForTesting(&groups);
 
   EXPECT_TRUE(RunExtensionTest("content_settings/getresourceidentifiers"))
       << message_;
 
-  GetResourceIdentifiersFunction::SetPluginListForTesting(NULL);
+  GetResourceIdentifiersFunction::SetPluginGroupsForTesting(NULL);
 }