Move enable_app_list to a buildflag.

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 ecb95d072455e9e6a94c40461b86775107a6575e..81283886b69d35f80b180e99ce9a39b5ade4ae4c 100644
--- a/chrome/common/pref_names.cc
+++ b/chrome/common/pref_names.cc
@@ -14,7 +14,7 @@ namespace prefs {
 // *************** PROFILE PREFS ***************
 // These are attached to the user profile
 
-#if defined(OS_CHROMEOS) && defined(ENABLE_APP_LIST)
+#if defined(OS_CHROMEOS) && BUILDFLAG(ENABLE_APP_LIST)
 // A preference to keep list of Android apps and their state.
 const char kArcApps[] = "arc.apps";
 // A preference to store backup and restore state for Android apps.
@@ -2081,7 +2081,7 @@ const char kRLZBrand[] = "rlz.brand";
 const char kRLZDisabled[] = "rlz.disabled";
 #endif
 
-#if defined(ENABLE_APP_LIST)
+#if BUILDFLAG(ENABLE_APP_LIST)
 // The directory in user data dir that contains the profile to be used with the
 // app launcher.
 const char kAppListProfile[] = "app_list.profile";
@@ -2125,7 +2125,7 @@ const char kAppLauncherDriveAppMapping[] =
 // A list of Drive app ids that tracks the uninstallable Drive apps.
 const char kAppLauncherUninstalledDriveApps[] =
     "apps.app_launcher.uninstalled_drive_apps";
-#endif  // defined(ENABLE_APP_LIST)
+#endif  // BUILDFLAG(ENABLE_APP_LIST)
 
 #if defined(OS_WIN)
 // If set, the user requested to launch the app with this extension id while