Add base:: to string16s in chrome/.

chrome/utility/importer/nss_decryptor.cc

Index: chrome/utility/importer/nss_decryptor.cc
diff --git a/chrome/utility/importer/nss_decryptor.cc b/chrome/utility/importer/nss_decryptor.cc
index a06f2085dfb39a55c39bad6e7ee19b0d88a56c3c..652fed7f9dcfc1b79eb0d6efd76879282b493ef4 100644
--- a/chrome/utility/importer/nss_decryptor.cc
+++ b/chrome/utility/importer/nss_decryptor.cc
@@ -61,10 +61,10 @@
 *
 * ***** END LICENSE BLOCK ***** */
 
-string16 NSSDecryptor::Decrypt(const std::string& crypt) const {
+base::string16 NSSDecryptor::Decrypt(const std::string& crypt) const {
   // Do nothing if NSS is not loaded.
   if (!is_nss_initialized_)
-    return string16();
+    return base::string16();
 
   // The old style password is encoded in base64. They are identified
   // by a leading '~'. Otherwise, we should decrypt the text.
@@ -76,7 +76,7 @@ string16 NSSDecryptor::Decrypt(const std::string& crypt) const {
     SECStatus result = PK11_Authenticate(slot, PR_TRUE, NULL);
     if (result != SECSuccess) {
       FreeSlot(slot);
-      return string16();
+      return base::string16();
     }
 
     SECItem request;