Standardize usage of virtual/override/final in content/browser/

content/browser/dom_storage/dom_storage_area_unittest.cc

 // Copyright 2013 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/bind.h"
 #include "base/files/file_util.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/message_loop/message_loop.h"
 #include "base/message_loop/message_loop_proxy.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 40 matching lines @@
     EXPECT_TRUE(area->SetItem(kKey2, kValue2, &old_value));
     EXPECT_TRUE(area->commit_batch_.get());
     EXPECT_EQ(1, area->commit_batches_in_flight_);
     EXPECT_TRUE(area->HasUncommittedChanges());
   }
 
   // Class used in the CommitChangesAtShutdown test case.
   class VerifyChangesCommittedDatabase : public DOMStorageDatabase {
    public:
     VerifyChangesCommittedDatabase() {}
-    virtual ~VerifyChangesCommittedDatabase() {
+    ~VerifyChangesCommittedDatabase() override {
       const base::string16 kKey(ASCIIToUTF16("key"));
       const base::string16 kValue(ASCIIToUTF16("value"));
       DOMStorageValuesMap values;
       ReadAllValues(&values);
       EXPECT_EQ(1u, values.size());
       EXPECT_EQ(kValue, values[kKey].string());
     }
   };
 
  private:
@@ skipping 394 matching lines @@
   EXPECT_EQ(
       base::FilePath().AppendASCII("-journal"),
       DOMStorageDatabase::GetJournalFilePath(base::FilePath()));
   EXPECT_EQ(
       base::FilePath().AppendASCII(".extensiononly-journal"),
       DOMStorageDatabase::GetJournalFilePath(
           base::FilePath().AppendASCII(".extensiononly")));
 }
 
 }  // namespace content