Add explicit base namespace to string16 users.

chrome/common/importer/importer_bridge.h

Index: chrome/common/importer/importer_bridge.h
diff --git a/chrome/common/importer/importer_bridge.h b/chrome/common/importer/importer_bridge.h
index 8aaf40d550bfb6c4dac9a6636d9eb7fd8e3f273d..c0903ff6f69e051f50b2b40c862483a09d2939d9 100644
--- a/chrome/common/importer/importer_bridge.h
+++ b/chrome/common/importer/importer_bridge.h
@@ -37,7 +37,7 @@ class ImporterBridge : public base::RefCountedThreadSafe<ImporterBridge> {
 
   virtual void AddBookmarks(
       const std::vector<ImportedBookmarkEntry>& bookmarks,
-      const string16& first_folder_name) = 0;
+      const base::string16& first_folder_name) = 0;
 
   virtual void AddHomePage(const GURL& home_page) = 0;
 
@@ -81,7 +81,7 @@ class ImporterBridge : public base::RefCountedThreadSafe<ImporterBridge> {
   // this calls the set of strings we've ported over to the external process.
   // It's good to avoid having to create a separate ResourceBundle for the
   // external import process, since the importer only needs a few strings.
-  virtual string16 GetLocalizedString(int message_id) = 0;
+  virtual base::string16 GetLocalizedString(int message_id) = 0;
 
  protected:
   friend class base::RefCountedThreadSafe<ImporterBridge>;