Coalesce more hardcoded schemes to using predefined constants.

chrome/browser/extensions/user_script_master.cc

Index: chrome/browser/extensions/user_script_master.cc
===================================================================
--- chrome/browser/extensions/user_script_master.cc	(revision 10345)
+++ chrome/browser/extensions/user_script_master.cc	(working copy)
@@ -14,12 +14,9 @@
 #include "base/string_util.h"
 #include "chrome/common/notification_service.h"
 #include "chrome/common/stl_util-inl.h"
+#include "chrome/common/url_constants.h"
 #include "net/base/net_util.h"
 
-// Defined in extension.h.
-extern const char kExtensionURLScheme[];
-extern const char kUserScriptURLScheme[];
-
 // static
 bool GetDeclarationValue(const StringPiece& line, const StringPiece& prefix,
                          std::string* value) {
@@ -158,7 +155,7 @@
          file = enumerator.Next()) {
       all_scripts.push_back(UserScript());
       UserScript& info = all_scripts.back();
-      info.set_url(GURL(std::string(kUserScriptURLScheme) + ":/" + 
+      info.set_url(GURL(std::string(chrome::kUserScriptScheme) + ":/" + 
           net::FilePathToFileURL(file.ToWStringHack()).ExtractFileName()));
       info.set_path(file);
     }