Remove unnecessary calls to std::basic_string<>::c_str()

chrome/browser/extensions/api/autotest_private/autotest_private_api.cc

Index: chrome/browser/extensions/api/autotest_private/autotest_private_api.cc
diff --git a/chrome/browser/extensions/api/autotest_private/autotest_private_api.cc b/chrome/browser/extensions/api/autotest_private/autotest_private_api.cc
index bb489e1cbe43cf0fe03f0b8b81fab357e6a30fc6..c11364a72883c62385869d3117dca10f06623232 100644
--- a/chrome/browser/extensions/api/autotest_private/autotest_private_api.cc
+++ b/chrome/browser/extensions/api/autotest_private/autotest_private_api.cc
@@ -62,7 +62,7 @@ base::ListValue* GetAPIPermissions(const Extension* ext) {
       ext->permissions_data()->active_permissions().GetAPIsAsStrings();
   for (std::set<std::string>::const_iterator perm = perm_list.begin();
        perm != perm_list.end(); ++perm) {
-    permissions->AppendString(perm->c_str());
+    permissions->AppendString(*perm);
   }
   return permissions;
 }