Add base:: to string16s in chrome/.

chrome/utility/importer/external_process_importer_bridge.h

Index: chrome/utility/importer/external_process_importer_bridge.h
diff --git a/chrome/utility/importer/external_process_importer_bridge.h b/chrome/utility/importer/external_process_importer_bridge.h
index 9bf5700e862a493a0c1ba5e283e4cb0e521eded2..57efe3548b509669c5bb4658b875335ad66a7146 100644
--- a/chrome/utility/importer/external_process_importer_bridge.h
+++ b/chrome/utility/importer/external_process_importer_bridge.h
@@ -47,9 +47,8 @@ class ExternalProcessImporterBridge : public ImporterBridge {
       base::TaskRunner* task_runner);
 
   // Begin ImporterBridge implementation:
-  virtual void AddBookmarks(
-      const std::vector<ImportedBookmarkEntry>& bookmarks,
-      const string16& first_folder_name) OVERRIDE;
+  virtual void AddBookmarks(const std::vector<ImportedBookmarkEntry>& bookmarks,
+                            const base::string16& first_folder_name) OVERRIDE;
 
   virtual void AddHomePage(const GURL& home_page) OVERRIDE;
 
@@ -79,7 +78,7 @@ class ExternalProcessImporterBridge : public ImporterBridge {
   virtual void NotifyItemEnded(importer::ImportItem item) OVERRIDE;
   virtual void NotifyEnded() OVERRIDE;
 
-  virtual string16 GetLocalizedString(int message_id) OVERRIDE;
+  virtual base::string16 GetLocalizedString(int message_id) OVERRIDE;
   // End ImporterBridge implementation.
 
  private: