base: Add missing "virtual" keyword and OVERRIDE to some methods.

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 "base/float_util.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/string_number_conversions.h"
@@ skipping 122 matching lines @@
 // A variant on StringValue that uses StringPiece instead of copying the string
 // into the Value. This can only be stored in a child of hidden root (above),
 // otherwise the referenced string will not be guaranteed to outlive it.
 class JSONStringValue : public base::Value {
  public:
   explicit JSONStringValue(const base::StringPiece& piece)
       : Value(TYPE_STRING),
         string_piece_(piece) {
   }
 
-  // Value:
-  bool GetAsString(std::string* out_value) const OVERRIDE {
+  // Overridden from base::Value:
+  virtual bool GetAsString(std::string* out_value) const OVERRIDE {
     string_piece_.CopyToString(out_value);
     return true;
   }
-  bool GetAsString(string16* out_value) const OVERRIDE {
+  virtual bool GetAsString(string16* out_value) const OVERRIDE {
     *out_value = UTF8ToUTF16(string_piece_);
     return true;
   }
   virtual Value* DeepCopy() const OVERRIDE {
     return Value::CreateStringValue(string_piece_.as_string());
   }
   virtual bool Equals(const Value* other) const OVERRIDE {
     std::string other_string;
     return other->IsType(TYPE_STRING) && other->GetAsString(&other_string) &&
         StringPiece(other_string) == string_piece_;
@@ skipping 802 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