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

webkit/plugins/ppapi/content_decryptor_delegate.cc

Index: webkit/plugins/ppapi/content_decryptor_delegate.cc
diff --git a/webkit/plugins/ppapi/content_decryptor_delegate.cc b/webkit/plugins/ppapi/content_decryptor_delegate.cc
index 8515531f18b49b61642e1e662dec8e3be2fe215a..5e3a64987d630ff1648581a32cda3afc77dab707 100644
--- a/webkit/plugins/ppapi/content_decryptor_delegate.cc
+++ b/webkit/plugins/ppapi/content_decryptor_delegate.cc
@@ -627,7 +627,8 @@ void ContentDecryptorDelegate::KeyAdded(PP_Var key_system_var,
   StringVar* key_system_string = StringVar::FromPPVar(key_system_var);
   StringVar* session_id_string = StringVar::FromPPVar(session_id_var);
   if (!key_system_string || !session_id_string) {
-    key_error_cb_.Run("", "", media::Decryptor::kUnknownError, 0);
+    key_error_cb_.Run(
+        std::string(), std::string(), media::Decryptor::kUnknownError, 0);
     return;
   }
 
@@ -656,7 +657,8 @@ void ContentDecryptorDelegate::KeyMessage(PP_Var key_system_var,
   StringVar* default_url_string = StringVar::FromPPVar(default_url_var);
 
   if (!key_system_string || !session_id_string || !default_url_string) {
-    key_error_cb_.Run("", "", media::Decryptor::kUnknownError, 0);
+    key_error_cb_.Run(
+        std::string(), std::string(), media::Decryptor::kUnknownError, 0);
     return;
   }
 
@@ -676,7 +678,8 @@ void ContentDecryptorDelegate::KeyError(PP_Var key_system_var,
   StringVar* key_system_string = StringVar::FromPPVar(key_system_var);
   StringVar* session_id_string = StringVar::FromPPVar(session_id_var);
   if (!key_system_string || !session_id_string) {
-    key_error_cb_.Run("", "", media::Decryptor::kUnknownError, 0);
+    key_error_cb_.Run(
+        std::string(), std::string(), media::Decryptor::kUnknownError, 0);
     return;
   }