Cleanup: Better constify some strings in chrome/browser/{chromeos,extensions}.

chrome/browser/chromeos/extensions/default_app_order.cc

Index: chrome/browser/chromeos/extensions/default_app_order.cc
diff --git a/chrome/browser/chromeos/extensions/default_app_order.cc b/chrome/browser/chromeos/extensions/default_app_order.cc
index 7055356123368d916c117e52c0e797589820fb3a..71c38749fea144234be27763d0eba42e24190ae0 100644
--- a/chrome/browser/chromeos/extensions/default_app_order.cc
+++ b/chrome/browser/chromeos/extensions/default_app_order.cc
@@ -31,7 +31,7 @@ const char kDefaultAttr[] = "default";
 const char kNameAttr[] = "name";
 const char kImportDefaultOrderAttr[] = "import_default_order";
 
-const char* kDefaultAppOrder[] = {
+const char* const kDefaultAppOrder[] = {
     extension_misc::kChromeAppId,
     extensions::kWebStoreAppId,
     extension_misc::kGoogleSearchAppId,