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

media/filters/pipeline_integration_test.cc

 // Copyright (c) 2012 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.
 
 #include "media/filters/pipeline_integration_test_base.h"
 
 #include "base/bind.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/string_util.h"
 #include "build/build_config.h"
@@ skipping 298 matching lines @@
 
     CHECK_EQ(chunk_demuxer_->AddId(kSourceId, type, codecs), ChunkDemuxer::kOk);
     AppendData(initial_append_size_);
   }
 
   void DemuxerNeedKey(const std::string& type,
                       scoped_ptr<uint8[]> init_data, int init_data_size) {
     DCHECK(init_data.get());
     DCHECK_GT(init_data_size, 0);
     CHECK(!need_key_cb_.is_null());
-    need_key_cb_.Run("", "", type, init_data.Pass(), init_data_size);
+    need_key_cb_.Run(
+        std::string(), std::string(), type, init_data.Pass(), init_data_size);
   }
 
  private:
   base::FilePath file_path_;
   scoped_refptr<DecoderBuffer> file_data_;
   int current_position_;
   int initial_append_size_;
   std::string mimetype_;
   scoped_refptr<ChunkDemuxer> chunk_demuxer_;
   NeedKeyCB need_key_cb_;
@@ skipping 586 matching lines @@
 // back.
 // Disabled since it might crash or corrupt heap, see http://crbug.com/173333
 TEST_F(PipelineIntegrationTest, DISABLED_BasicPlayback_VP9_Opus_WebM) {
   ASSERT_TRUE(Start(GetTestDataFilePath("bear-vp9-opus.webm"),
                     PIPELINE_OK));
   Play();
   ASSERT_TRUE(WaitUntilOnEnded());
 }
 
 }  // namespace media