Remove all occurrences of "using std::string".

webrtc/tools/frame_editing/frame_editing_lib.cc

 /*
  *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
 #include <stdio.h>
 #include <stdlib.h>
 
 #include <memory>
 #include <string>
 
 #include "webrtc/common_video/libyuv/include/webrtc_libyuv.h"
 #include "webrtc/tools/frame_editing/frame_editing_lib.h"
 #include "webrtc/typedefs.h"
 
-using std::string;
-
 namespace webrtc {
 
-int EditFrames(const string& in_path, int width, int height,
+int EditFrames(const std::string& in_path, int width, int height,
                int first_frame_to_process, int interval,
-               int last_frame_to_process, const string& out_path) {
+               int last_frame_to_process, const std::string& out_path) {
   if (last_frame_to_process < first_frame_to_process) {
     fprintf(stderr, "The set of frames to cut is empty! (l < f)\n");
     return -10;
   }
 
   FILE* in_fid = fopen(in_path.c_str() , "rb");
   if (!in_fid) {
     fprintf(stderr, "Could not read input file: %s.\n", in_path.c_str());
     return -11;
   }
@@ skipping 42 matching lines @@
   if (num_bytes_read > 0 && num_bytes_read < frame_length) {
     printf("Frame to small! Last frame truncated.\n");
   }
   fclose(in_fid);
   fclose(out_fid);
 
   printf("Done editing!\n");
   return 0;
 }
 }  // namespace webrtc