Add more string_util functions to base namespace.

chrome/browser/extensions/menu_manager.cc

Index: chrome/browser/extensions/menu_manager.cc
diff --git a/chrome/browser/extensions/menu_manager.cc b/chrome/browser/extensions/menu_manager.cc
index 95993c9906ec963d80a5a8d44210152a3ea07fcf..d778ae4d0d5a8d9ebaad9278f96376a956f12681 100644
--- a/chrome/browser/extensions/menu_manager.cc
+++ b/chrome/browser/extensions/menu_manager.cc
@@ -172,7 +172,8 @@ base::string16 MenuItem::TitleWithReplacement(const base::string16& selection,
   base::string16 result = base::UTF8ToUTF16(title_);
   // TODO(asargent) - Change this to properly handle %% escaping so you can
   // put "%s" in titles that won't get substituted.
-  ReplaceSubstringsAfterOffset(&result, 0, base::ASCIIToUTF16("%s"), selection);
+  base::ReplaceSubstringsAfterOffset(
+      &result, 0, base::ASCIIToUTF16("%s"), selection);
 
   if (result.length() > max_length)
     result = gfx::TruncateString(result, max_length, gfx::WORD_BREAK);