Cleanup: Remove some redundant container clear() calls.

chrome/browser/plugins/plugin_finder.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 "chrome/browser/plugins/plugin_finder.h"
 
 #include "base/bind.h"
 #include "base/json/json_reader.h"
 #include "base/message_loop/message_loop.h"
 #include "base/prefs/pref_registry_simple.h"
@@ skipping 223 matching lines @@
   base::AutoLock lock(mutex_);
   int version = 0;  // If no version is defined, we default to 0.
   const char kVersionKey[] = "x-version";
   plugin_list->GetInteger(kVersionKey, &version);
   if (version <= version_)
     return;
 
   version_ = version;
 
   STLDeleteValues(&identifier_plugin_);
-  identifier_plugin_.clear();
 
   for (base::DictionaryValue::Iterator plugin_it(*plugin_list);
       !plugin_it.IsAtEnd(); plugin_it.Advance()) {
     const base::DictionaryValue* plugin = NULL;
     const std::string& identifier = plugin_it.key();
     if (plugin_list->GetDictionaryWithoutPathExpansion(identifier, &plugin)) {
       DCHECK(!identifier_plugin_[identifier]);
       identifier_plugin_[identifier] = CreatePluginMetadata(identifier, plugin);
 
 #if defined(ENABLE_PLUGIN_INSTALLATION)
@@ skipping 40 matching lines @@
     metadata->AddMatchingMimeType(plugin.mime_types[i].mime_type);
 
   DCHECK(metadata->MatchesPlugin(plugin));
   if (identifier_plugin_.find(identifier) != identifier_plugin_.end())
     identifier = GetLongIdentifier(plugin);
 
   DCHECK(identifier_plugin_.find(identifier) == identifier_plugin_.end());
   identifier_plugin_[identifier] = metadata;
   return metadata->Clone();
 }