Plugin Power Saver: Replace all "plug-in" with "plugin" for consistency.

content/test/plugin/plugin_thread_async_call_test.cc

Index: content/test/plugin/plugin_thread_async_call_test.cc
diff --git a/content/test/plugin/plugin_thread_async_call_test.cc b/content/test/plugin/plugin_thread_async_call_test.cc
index 096041c013931a4d44a42bc65939f6d5b470824d..4afd00425f061b1fe7a3e9ad32a631dfcd79326d 100644
--- a/content/test/plugin/plugin_thread_async_call_test.cc
+++ b/content/test/plugin/plugin_thread_async_call_test.cc
@@ -67,7 +67,7 @@ NPError PluginThreadAsyncCallTest::New(
   // a different thread to fully test it.
   if (this == g_short_lived_instance) {
     // This is slightly complicated thanks to the Linux shared library build,
-    // which shares more compilation units between the NPAPI plug-in and
+    // which shares more compilation units between the NPAPI plugin and
     // the base code.
     at_exit_manager_ = new base::ShadowingAtExitManager();
     base::Thread random_thread("random_thread");