Reduce namespaces for ash::launcher::AppLauncherId

chrome/browser/ui/ash/chrome_launcher_prefs.h

Index: chrome/browser/ui/ash/chrome_launcher_prefs.h
diff --git a/chrome/browser/ui/ash/chrome_launcher_prefs.h b/chrome/browser/ui/ash/chrome_launcher_prefs.h
index f54481c6e2c521e8f1f64d8ee7e8bc5ca95d1928..1fda7a7a01d0e24f80b768e032f6dd4bd96c158f 100644
--- a/chrome/browser/ui/ash/chrome_launcher_prefs.h
+++ b/chrome/browser/ui/ash/chrome_launcher_prefs.h
@@ -26,10 +26,11 @@ class PrefRegistrySyncable;
 }
 
 namespace ash {
-namespace launcher {
 
 class AppLauncherId;
 
+namespace launcher {
+
 // Path within the dictionary entries in the prefs::kPinnedLauncherApps list
 // specifying the extension ID of the app to be pinned by that entry.
 extern const char kPinnedAppsPrefAppIDPath[];