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

chrome/browser/plugins/plugin_observer.cc

Index: chrome/browser/plugins/plugin_observer.cc
diff --git a/chrome/browser/plugins/plugin_observer.cc b/chrome/browser/plugins/plugin_observer.cc
index 53b96a03150e751e9a685239879fe0ed708bd6db..23ba08b05904217eebfef9961689f521d53a5524 100644
--- a/chrome/browser/plugins/plugin_observer.cc
+++ b/chrome/browser/plugins/plugin_observer.cc
@@ -382,8 +382,8 @@ void PluginObserver::OnBlockedOutdatedPlugin(int placeholder_id,
     NOTREACHED();
   }
 #else
-  // If we don't support third-party plug-in installation, we shouldn't have
-  // outdated plug-ins.
+  // If we don't support third-party plugin installation, we shouldn't have
+  // outdated plugins.
   NOTREACHED();
 #endif  // defined(ENABLE_PLUGIN_INSTALLATION)
 }