Move IsStringUTF8/ASCII to base namespace

content/browser/browser_plugin/browser_plugin_guest_manager.cc

Index: content/browser/browser_plugin/browser_plugin_guest_manager.cc
diff --git a/content/browser/browser_plugin/browser_plugin_guest_manager.cc b/content/browser/browser_plugin/browser_plugin_guest_manager.cc
index 4bc4235a6ca4dfeb8a603821263b737aefda5d0b..4bf7fe519c544a62d546eb4d8987e30d495173dd 100644
--- a/content/browser/browser_plugin/browser_plugin_guest_manager.cc
+++ b/content/browser/browser_plugin/browser_plugin_guest_manager.cc
@@ -78,7 +78,7 @@ BrowserPluginGuest* BrowserPluginGuestManager::CreateGuest(
   // since we depend on this in other parts of the code, such as FilePath
   // creation. If the validation fails, treat it as a bad message and kill the
   // renderer process.
-  if (!IsStringUTF8(params.storage_partition_id)) {
+  if (!base::IsStringUTF8(params.storage_partition_id)) {
     content::RecordAction(
         base::UserMetricsAction("BadMessageTerminate_BPGM"));
     base::KillProcess(