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

content/shell/geolocation/shell_access_token_store.cc

Index: content/shell/geolocation/shell_access_token_store.cc
diff --git a/content/shell/geolocation/shell_access_token_store.cc b/content/shell/geolocation/shell_access_token_store.cc
index 4b8b0074e9273efcf1111252d0214a12122dd346..cec481d50180db14ea6522697188f645da898345 100644
--- a/content/shell/geolocation/shell_access_token_store.cc
+++ b/content/shell/geolocation/shell_access_token_store.cc
@@ -44,7 +44,7 @@ void ShellAccessTokenStore::RespondOnOriginatingThread(
   // Since content_shell is a test executable, rather than an end user program,
   // we provide a dummy access_token set to avoid hitting the server.
   AccessTokenSet access_token_set;
-  access_token_set[GURL()] = ASCIIToUTF16("chromium_content_shell");
+  access_token_set[GURL()] = base::ASCIIToUTF16("chromium_content_shell");
   callback.Run(access_token_set, system_request_context_);
 }