Move StringPiece into the base namespace. It is colliding

chrome/browser/browser_main.cc

Index: chrome/browser/browser_main.cc
diff --git a/chrome/browser/browser_main.cc b/chrome/browser/browser_main.cc
index d470dbf99b9d2a32f2cd8e46b248f981705c773f..27808aa0a198ab8e829dcaf1ace971169ea59779 100644
--- a/chrome/browser/browser_main.cc
+++ b/chrome/browser/browser_main.cc
@@ -190,9 +190,9 @@ base::LazyInstance<LazyDirectoryListerCacher> lazy_dir_lister(
     base::LINKER_INITIALIZED);
 
 // This is called indirectly by the network layer to access resources.
-StringPiece NetResourceProvider(int key) {
+base::StringPiece NetResourceProvider(int key) {
   if (IDR_DIR_HEADER_HTML == key)
-    return StringPiece(lazy_dir_lister.Pointer()->html_data);
+    return base::StringPiece(lazy_dir_lister.Pointer()->html_data);
 
   return ResourceBundle::GetSharedInstance().GetRawDataResource(key);
 }