Add more string_util functions to base namespace.

ppapi/shared_impl/var.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ppapi/shared_impl/var.h"
 
 #include <limits>
 
 #include "base/logging.h"
 #include "base/strings/string_number_conversions.h"
@@ skipping 27 matching lines @@
         return "[Invalid string]";
 
       // Since this is for logging, escape NULLs, truncate length.
       std::string result;
       const size_t kTruncateAboveLength = 128;
       if (string->value().size() > kTruncateAboveLength)
         result = string->value().substr(0, kTruncateAboveLength) + "...";
       else
         result = string->value();
 
-      std::string null;
-      null.push_back(0);
-      ReplaceSubstringsAfterOffset(&result, 0, null, "\\0");
+      base::ReplaceSubstringsAfterOffset(
+          &result, 0, base::StringPiece("\0", 1), "\\0");
       return result;
     }
     case PP_VARTYPE_OBJECT:
       return "[Object]";
     case PP_VARTYPE_ARRAY:
       return "[Array]";
     case PP_VARTYPE_DICTIONARY:
       return "[Dictionary]";
     case PP_VARTYPE_ARRAY_BUFFER:
       return "[Array buffer]";
@@ skipping 125 matching lines @@
   if (var.type != PP_VARTYPE_ARRAY_BUFFER)
     return NULL;
   scoped_refptr<Var> var_object(
       PpapiGlobals::Get()->GetVarTracker()->GetVar(var));
   if (!var_object.get())
     return NULL;
   return var_object->AsArrayBufferVar();
 }
 
 }  // namespace ppapi