Fixes for re-enabling more MSVC level 4 warnings: chrome/browser/ edition

chrome/browser/apps/drive/drive_app_mapping.cc

 // Copyright 2014 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/apps/drive/drive_app_mapping.h"
 
 #include "base/prefs/pref_service.h"
 #include "base/prefs/scoped_user_pref_update.h"
 #include "base/values.h"
 #include "chrome/common/pref_names.h"
@@ skipping 83 matching lines @@
 }
 
 bool DriveAppMapping::IsChromeAppGenerated(
     const std::string& chrome_app_id) const {
   const base::DictionaryValue* mapping =
       prefs_->GetDictionary(prefs::kAppLauncherDriveAppMapping);
   for (base::DictionaryValue::Iterator it(*mapping); !it.IsAtEnd();
        it.Advance()) {
     const base::DictionaryValue* info_dict;
     std::string value_string;
-    bool generated;
+    bool generated = false;
     DCHECK(it.value().IsType(base::Value::TYPE_DICTIONARY));
     if (it.value().GetAsDictionary(&info_dict) &&
         info_dict->GetStringWithoutPathExpansion(kKeyChromeApp,
                                                  &value_string) &&
         value_string == chrome_app_id &&
         info_dict->GetBooleanWithoutPathExpansion(kKeyGenerated, &generated)) {
       return generated;
     }
   }
 
   return false;
 }
 
 std::set<std::string> DriveAppMapping::GetDriveAppIds() const {
   const base::DictionaryValue* mapping =
       prefs_->GetDictionary(prefs::kAppLauncherDriveAppMapping);
   std::set<std::string> keys;
   for (base::DictionaryValue::Iterator it(*mapping); !it.IsAtEnd();
        it.Advance()) {
     keys.insert(it.key());
   }
   return keys;
 }