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

content/test/plugin/plugin_geturl_test.cc

Index: content/test/plugin/plugin_geturl_test.cc
diff --git a/content/test/plugin/plugin_geturl_test.cc b/content/test/plugin/plugin_geturl_test.cc
index c9b344de3ad304fa48a3fbd76ff91ab8ea47173c..20838e533b31044b70fc919ce7fdf9b35885e79a 100644
--- a/content/test/plugin/plugin_geturl_test.cc
+++ b/content/test/plugin/plugin_geturl_test.cc
@@ -206,7 +206,7 @@ NPError PluginGetURLTest::NewStream(NPMIMEType type, NPStream* stream,
 #if defined(OS_WIN)
         filename = filename.substr(8);  // remove "file:///"
         // Assume an ASCII path on Windows.
-        base::FilePath path = base::FilePath(ASCIIToWide(filename));
+        base::FilePath path = base::FilePath(base::ASCIIToWide(filename));
 #else
         filename = filename.substr(7);  // remove "file://"
         base::FilePath path = base::FilePath(filename);