Move IsStringASCII/UTF8 to base namespace.

chrome/browser/extensions/api/cookies/cookies_helpers.cc

Index: chrome/browser/extensions/api/cookies/cookies_helpers.cc
diff --git a/chrome/browser/extensions/api/cookies/cookies_helpers.cc b/chrome/browser/extensions/api/cookies/cookies_helpers.cc
index 750bd1e6aed0d001a89a264b92ce90d9bb508d96..c29a93803b70c9f234360aa7ed8b38f75cd8ff2c 100644
--- a/chrome/browser/extensions/api/cookies/cookies_helpers.cc
+++ b/chrome/browser/extensions/api/cookies/cookies_helpers.cc
@@ -76,8 +76,8 @@ scoped_ptr<Cookie> CreateCookie(
   cookie->host_only = net::cookie_util::DomainIsHostOnly(
       canonical_cookie.Domain());
   // A non-UTF8 path is invalid, so we just replace it with an empty string.
-  cookie->path = IsStringUTF8(canonical_cookie.Path()) ? canonical_cookie.Path()
-                                                       : std::string();
+  cookie->path = base::IsStringUTF8(canonical_cookie.Path())
+      ? canonical_cookie.Path() : std::string();
   cookie->secure = canonical_cookie.IsSecure();
   cookie->http_only = canonical_cookie.IsHttpOnly();
   cookie->session = !canonical_cookie.IsPersistent();