Move StringPiece into the base namespace. It is colliding

chrome/browser/browser_about_handler.cc

Index: chrome/browser/browser_about_handler.cc
diff --git a/chrome/browser/browser_about_handler.cc b/chrome/browser/browser_about_handler.cc
index c7805eb15f9cf707d990189b1b8547ed93c9dfdd..047ca97f29b6468d0e9b49ef802115ac06651784 100644
--- a/chrome/browser/browser_about_handler.cc
+++ b/chrome/browser/browser_about_handler.cc
@@ -247,7 +247,7 @@ std::string AboutPlugins() {
   localized_strings.SetString(L"enabled_no",
       l10n_util::GetString(IDS_ABOUT_PLUGINS_ENABLED_NO));
 
-  static const StringPiece plugins_html(
+  static const base::StringPiece plugins_html(
       ResourceBundle::GetSharedInstance().GetRawDataResource(
           IDR_ABOUT_PLUGINS_HTML));
 
@@ -348,7 +348,7 @@ std::string AboutStats() {
   }
 
   // Get about_stats.html
-  static const StringPiece stats_html(
+  static const base::StringPiece stats_html(
       ResourceBundle::GetSharedInstance().GetRawDataResource(
           IDR_ABOUT_STATS_HTML));
 
@@ -514,7 +514,7 @@ std::string AboutSync() {
                      full_status.max_consecutive_errors);
   }
 
-  static const StringPiece sync_html(
+  static const base::StringPiece sync_html(
       ResourceBundle::GetSharedInstance().GetRawDataResource(
       IDR_ABOUT_SYNC_HTML));
 
@@ -720,7 +720,7 @@ void AboutMemoryHandler::OnDetailsAvailable() {
   }
 
   // Get about_memory.html
-  static const StringPiece memory_html(
+  static const base::StringPiece memory_html(
       ResourceBundle::GetSharedInstance().GetRawDataResource(
           IDR_ABOUT_MEMORY_HTML));