Move StringPiece into the base namespace. It is colliding

chrome/browser/views/sync/sync_setup_wizard.cc

Index: chrome/browser/views/sync/sync_setup_wizard.cc
diff --git a/chrome/browser/views/sync/sync_setup_wizard.cc b/chrome/browser/views/sync/sync_setup_wizard.cc
index 0421e4e3d049d6d82d9049120a3272f31f9bdf1c..3b187f7b66271f4ff8231e8f6e4a5580c62f9829 100644
--- a/chrome/browser/views/sync/sync_setup_wizard.cc
+++ b/chrome/browser/views/sync/sync_setup_wizard.cc
@@ -49,15 +49,15 @@ void SyncResourcesSource::StartDataRequest(const std::string& path_raw,
 
   std::string response;
   if (path_raw == chrome::kSyncGaiaLoginPath) {
-    static const StringPiece html(ResourceBundle::GetSharedInstance()
+    static const base::StringPiece html(ResourceBundle::GetSharedInstance()
         .GetRawDataResource(IDR_GAIA_LOGIN_HTML));
     response = html.as_string();
   } else if (path_raw == chrome::kSyncMergeAndSyncPath) {
-    static const StringPiece html(ResourceBundle::GetSharedInstance()
+    static const base::StringPiece html(ResourceBundle::GetSharedInstance()
         .GetRawDataResource(IDR_MERGE_AND_SYNC_HTML));
     response = html.as_string();
   } else if (path_raw == chrome::kSyncSetupFlowPath) {
-    static const StringPiece html(ResourceBundle::GetSharedInstance()
+    static const base::StringPiece html(ResourceBundle::GetSharedInstance()
         .GetRawDataResource(IDR_SYNC_SETUP_FLOW_HTML));
     response = html.as_string();
   }