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

content/child/npapi/plugin_instance.cc

Index: content/child/npapi/plugin_instance.cc
diff --git a/content/child/npapi/plugin_instance.cc b/content/child/npapi/plugin_instance.cc
index 30b3a586339a38fd2e1f41546913563fae785150..a7e2b94ea8e0e5d83ae64214a1d48a15d98b9b4d 100644
--- a/content/child/npapi/plugin_instance.cc
+++ b/content/child/npapi/plugin_instance.cc
@@ -184,7 +184,7 @@ bool PluginInstance::GetFormValue(base::string16* value) {
     return false;
   }
   // Assumes the result is UTF8 text, as Firefox does.
-  *value = UTF8ToUTF16(plugin_value);
+  *value = base::UTF8ToUTF16(plugin_value);
   host_->host_functions()->memfree(plugin_value);
   return true;
 }