Rewrite std::string("") to std::string(), Linux edition.

webkit/media/crypto/ppapi/clear_key_cdm.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 "webkit/media/crypto/ppapi/clear_key_cdm.h"
 
 #include <algorithm>
 #include <sstream>
 #include <string>
 #include <vector>
@@ skipping 231 matching lines @@
 
 cdm::Status ClearKeyCdm::AddKey(const char* session_id,
                                 int session_id_size,
                                 const uint8_t* key,
                                 int key_size,
                                 const uint8_t* key_id,
                                 int key_id_size) {
   DVLOG(1) << "AddKey()";
   base::AutoLock auto_lock(client_lock_);
   ScopedResetter<Client> auto_resetter(&client_);
-  decryptor_.AddKey("", key, key_size, key_id, key_id_size,
+  decryptor_.AddKey(std::string(),
+                    key,
+                    key_size,
+                    key_id,
+                    key_id_size,
                     std::string(session_id, session_id_size));
 
   if (client_.status() != Client::kKeyAdded)
     return cdm::kSessionError;
 
   if (!timer_set_) {
     ScheduleNextHeartBeat();
     timer_set_ = true;
   }
 
   return cdm::kSuccess;
 }
 
 cdm::Status ClearKeyCdm::CancelKeyRequest(const char* session_id,
                                           int session_id_size) {
   DVLOG(1) << "CancelKeyRequest()";
   base::AutoLock auto_lock(client_lock_);
   ScopedResetter<Client> auto_resetter(&client_);
-  decryptor_.CancelKeyRequest("", std::string(session_id, session_id_size));
+  decryptor_.CancelKeyRequest(std::string(),
+                              std::string(session_id, session_id_size));
   return cdm::kSuccess;
 }
 
 void ClearKeyCdm::TimerExpired(void* context) {
   std::string heartbeat_message;
   if (!next_heartbeat_message_.empty() &&
       context == &next_heartbeat_message_[0]) {
     heartbeat_message = next_heartbeat_message_;
   } else {
     heartbeat_message = "ERROR: Invalid timer context found!";
@@ skipping 282 matching lines @@
   int samples_generated = GenerateFakeAudioFramesFromDuration(
       timestamp_in_microseconds - CurrentTimeStampInMicroseconds(),
       audio_frames);
   total_samples_generated_ += samples_generated;
 
   return samples_generated == 0 ? cdm::kNeedMoreData : cdm::kSuccess;
 }
 #endif  // CLEAR_KEY_CDM_USE_FAKE_AUDIO_DECODER
 
 }  // namespace webkit_media