Only dispatch tab events when there is someone listening

chrome/common/extensions/extension.cc

Index: chrome/common/extensions/extension.cc
diff --git a/chrome/common/extensions/extension.cc b/chrome/common/extensions/extension.cc
index db05c4bc819efaca3a6d5ac762c26b610fdd20e9..0447fade38139691d1a48b995ac4c251ed725475 100644
--- a/chrome/common/extensions/extension.cc
+++ b/chrome/common/extensions/extension.cc
@@ -99,9 +99,12 @@ const int Extension::kIconSizes[] = {
 const int Extension::kPageActionIconMaxSize = 19;
 const int Extension::kBrowserActionIconMaxSize = 19;
 
+const char* Extension::kTabPermission = "tabs";
+const char* Extension::kBookmarkPermission = "bookmarks";
+
 const char* Extension::kPermissionNames[] = {
-  "tabs",
-  "bookmarks",
+  Extension::kTabPermission,
+  Extension::kBookmarkPermission,
 };
 const size_t Extension::kNumPermissions =
     arraysize(Extension::kPermissionNames);