Update uses of UTF conversions in content/ to use the base:: namespace.

content/browser/geolocation/network_location_provider.cc

Index: content/browser/geolocation/network_location_provider.cc
diff --git a/content/browser/geolocation/network_location_provider.cc b/content/browser/geolocation/network_location_provider.cc
index efc68a732316faec4ee50b286e492a9a4e49e1dc..2a9d7c8a3b8711126b4bd6e5fa7cb8a3d73e48c6 100644
--- a/content/browser/geolocation/network_location_provider.cc
+++ b/content/browser/geolocation/network_location_provider.cc
@@ -77,7 +77,7 @@ bool NetworkLocationProvider::PositionCache::MakeKey(
   key->clear();
   const size_t kCharsPerMacAddress = 6 * 3 + 1;  // e.g. "11:22:33:44:55:66|"
   key->reserve(wifi_data.access_point_data.size() * kCharsPerMacAddress);
-  const base::string16 separator(ASCIIToUTF16("|"));
+  const base::string16 separator(base::ASCIIToUTF16("|"));
   for (WifiData::AccessPointDataSet::const_iterator iter =
        wifi_data.access_point_data.begin();
        iter != wifi_data.access_point_data.end();