Add base:: to string16s in chrome/.

chrome/utility/media_galleries/itunes_library_parser.cc

Index: chrome/utility/media_galleries/itunes_library_parser.cc
diff --git a/chrome/utility/media_galleries/itunes_library_parser.cc b/chrome/utility/media_galleries/itunes_library_parser.cc
index 85871a31632c1732e39b1c349d3229b47204e2ad..aef27f7a3675f7f05c8841a24d8233199fe0a01d 100644
--- a/chrome/utility/media_galleries/itunes_library_parser.cc
+++ b/chrome/utility/media_galleries/itunes_library_parser.cc
@@ -74,9 +74,11 @@ bool GetTrackInfoFromDict(XmlReader* reader, TrackInfo* result) {
                                          url.path().length() - 1,
                                          &decoded_location);
 #if defined(OS_WIN)
-      string16 location(decoded_location.data(), decoded_location.length());
+      base::string16 location(decoded_location.data(),
+                              decoded_location.length());
 #else
-      string16 location16(decoded_location.data(), decoded_location.length());
+      base::string16 location16(decoded_location.data(),
+                                decoded_location.length());
       std::string location = "/" + UTF16ToUTF8(location16);
 #endif
       result->location = base::FilePath(location);