Remove special handling for strings in var serialization.

ppapi/proxy/host_var_serialization_rules.h

Index: ppapi/proxy/host_var_serialization_rules.h
diff --git a/ppapi/proxy/host_var_serialization_rules.h b/ppapi/proxy/host_var_serialization_rules.h
index 609980fcd6491f54d676aa2643f378790c1a2e84..9f52aed7efcce96db2c0f453c29a6511b0fecd72 100644
--- a/ppapi/proxy/host_var_serialization_rules.h
+++ b/ppapi/proxy/host_var_serialization_rules.h
@@ -22,25 +22,17 @@ class HostVarSerializationRules : public VarSerializationRules {
   ~HostVarSerializationRules();
 
   // VarSerialization implementation.
-  virtual PP_Var SendCallerOwned(const PP_Var& var,
-                                 const std::string** str_ptr_out);
+  virtual PP_Var SendCallerOwned(const PP_Var& var);
   virtual PP_Var BeginReceiveCallerOwned(const PP_Var& var,
-                                         scoped_ptr<std::string> str,
                                          Dispatcher* dispatcher);
   virtual void EndReceiveCallerOwned(const PP_Var& var);
   virtual PP_Var ReceivePassRef(const PP_Var& var,
-                                scoped_ptr<std::string> str,
                                 Dispatcher* dispatcher);
-  virtual PP_Var BeginSendPassRef(const PP_Var& var,
-                                  const std::string** str_ptr_out);
+  virtual PP_Var BeginSendPassRef(const PP_Var& var);
   virtual void EndSendPassRef(const PP_Var& var, Dispatcher* dispatcher);
   virtual void ReleaseObjectRef(const PP_Var& var);
 
  private:
-  // Converts the given var (which must be a VARTYPE_STRING) to the given
-  // string object.
-  void VarToStringPtr(const PP_Var& var, const std::string** str);
-
   PP_Module pp_module_;
 
   DISALLOW_COPY_AND_ASSIGN(HostVarSerializationRules);