Use StringPiece more in base::Value interfaces.

base/json/json_parser.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 "base/json/json_parser.h"
 
 #include <cmath>
 #include <utility>
 
 #include "base/logging.h"
@@ skipping 43 matching lines @@
     // Then erase the contents of the current dictionary and swap in the
     // new contents, originally from |other|.
     Clear();
     json_.reset();
     DictionaryValue::Swap(copy.get());
   }
 
   // Not overriding DictionaryValue::Remove because it just calls through to
   // the method below.
 
-  bool RemoveWithoutPathExpansion(const std::string& key,
+  bool RemoveWithoutPathExpansion(StringPiece key,
                                   std::unique_ptr<Value>* out) override {
     // If the caller won't take ownership of the removed value, just call up.
     if (!out)
       return DictionaryValue::RemoveWithoutPathExpansion(key, out);
 
     DVLOG(1) << "Remove()ing from a DictionaryValue inefficiently.";
 
     // Otherwise, remove the value while its still "owned" by this and copy it
     // to convert any JSONStringValues to std::string.
     std::unique_ptr<Value> out_owned;
@@ skipping 905 matching lines @@
                                            const std::string& description) {
   if (line || column) {
     return StringPrintf("Line: %i, column: %i, %s",
         line, column, description.c_str());
   }
   return description;
 }
 
 }  // namespace internal
 }  // namespace base