Add SpdyString alias for std::string in net/spdy.

net/spdy/spdy_session_test_util.h

 // Copyright (c) 2013 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.
 
 #ifndef NET_SPDY_SPDY_SESSION_TEST_UTIL_H_
 #define NET_SPDY_SPDY_SESSION_TEST_UTIL_H_
 
 #include <stdint.h>
 
-#include <string>
-
 #include "base/message_loop/message_loop.h"
 #include "base/pending_task.h"
+#include "net/spdy/platform/api/spdy_string.h"
 
 namespace net {
 
 // SpdySessionTestTaskObserver is a MessageLoop::TaskObserver that monitors the
 // completion of all tasks executed by the current MessageLoop, recording the
 // number of tasks that refer to a specific function and filename.
 class SpdySessionTestTaskObserver : public base::MessageLoop::TaskObserver {
  public:
   // Creates a SpdySessionTaskObserver that will record all tasks that are
   // executed that were posted by the function named by |function_name|, located
   // in the file |file_name|.
   // Example:
   //  file_name = "foo.cc"
   //  function = "DoFoo"
-  SpdySessionTestTaskObserver(const std::string& file_name,
-                              const std::string& function_name);
+  SpdySessionTestTaskObserver(const SpdyString& file_name,
+                              const SpdyString& function_name);
   ~SpdySessionTestTaskObserver() override;
 
   // Implements MessageLoop::TaskObserver.
   void WillProcessTask(const base::PendingTask& pending_task) override;
   void DidProcessTask(const base::PendingTask& pending_task) override;
 
   // Returns the number of tasks posted by the given function and file.
   uint16_t executed_count() const { return executed_count_; }
 
  private:
   uint16_t executed_count_;
-  std::string file_name_;
-  std::string function_name_;
+  SpdyString file_name_;
+  SpdyString function_name_;
 };
 
 }  // namespace net
 
 #endif  // NET_SPDY_SPDY_SESSION_TEST_UTIL_H_