Move app_launcher.* out of chrome/browser/extensions and into apps/

chrome/common/pref_names.cc

Index: chrome/common/pref_names.cc
diff --git a/chrome/common/pref_names.cc b/chrome/common/pref_names.cc
index 3eaabc2e7251aa48679129ce7f29666ad1bc2bf4..e24255bec967abd7c8eddea5fdefc0f3cf020cd5 100644
--- a/chrome/common/pref_names.cc
+++ b/chrome/common/pref_names.cc
@@ -1611,10 +1611,6 @@ const char kExtensionInstallForceList[] = "extensions.install.forcelist";
 const char kExtensionStorageGarbageCollect[] =
     "extensions.storage.garbagecollect";
 
-// Local state caching knowledge of whether the app launcher is installed.
-const char kAppLauncherIsEnabled[] =
-    "extensions.app_launcher.should_show_apps_page";
-
 // Keeps track of which sessions are collapsed in the Other Devices menu.
 const char kNtpCollapsedForeignSessions[] = "ntp.collapsed_foreign_sessions";