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

webkit/media/crypto/ppapi/cdm_wrapper.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 <cstring>
 #include <map>
 #include <string>
 #include <utility>
 #include <vector>
 
@@ skipping 634 matching lines @@
 #if defined(CHECK_ORIGIN_URL)
   pp::InstancePrivate instance_private(pp_instance());
   pp::VarPrivate window = instance_private.GetWindowObject();
   std::string origin = window.GetProperty("top").GetProperty("location")
       .GetProperty("origin").AsString();
   PP_DCHECK(origin != "null");
 #endif  // defined(CHECK_ORIGIN_URL)
 
   if (!cdm_) {
     if (!CreateCdmInstance(key_system)) {
-      SendUnknownKeyError(key_system, "");
+      SendUnknownKeyError(key_system, std::string());
       return;
     }
   }
   PP_DCHECK(cdm_);
 
   // Must be set here in case the CDM synchronously calls a cdm::Host method.
   // Clear below on error.
   // TODO(ddorwin): Set/clear key_system_ & cdm_ at same time; clear both on
   // error below.
   key_system_ = key_system;
@@ skipping 521 matching lines @@
 }  // namespace webkit_media
 
 namespace pp {
 
 // Factory function for your specialization of the Module object.
 Module* CreateModule() {
   return new webkit_media::CdmWrapperModule();
 }
 
 }  // namespace pp