Remove empty-string comparisons.

webrtc/tools/agc/agc_test.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.
  */
 
@@ skipping 73 matching lines @@
 }
 
 void RunAgc() {
   test::TraceToStderr trace_to_stderr(true);
   FILE* in_file = fopen(FLAGS_in.c_str(), "rb");
   ASSERT_TRUE(in_file != NULL);
   FILE* out_file = fopen(FLAGS_out.c_str(), "wb");
   ASSERT_TRUE(out_file != NULL);
 
   int gain_map[256];
-  if (FLAGS_gain_file != "") {
+  if (!FLAGS_gain_file.empty()) {
     FILE* gain_file = fopen(FLAGS_gain_file.c_str(), "rt");
     ASSERT_TRUE(gain_file != NULL);
     ReadGainMapFromFile(gain_file, FLAGS_gain_offset, gain_map);
     fclose(gain_file);
   } else {
     CalculateGainMap(FLAGS_mic_gain, FLAGS_gain_offset, gain_map);
   }
 
   FakeVoEExternalMedia media;
   MockVoEVolumeControl volume;
@@ skipping 41 matching lines @@
 
 }  // namespace
 }  // namespace webrtc
 
 int main(int argc, char* argv[]) {
   google::SetUsageMessage(webrtc::kUsage);
   google::ParseCommandLineFlags(&argc, &argv, true);
   webrtc::RunAgc();
   return 0;
 }